fix(RDS): import RDS resource and add unit test and document.

docs/data-sources/rds_backups.md

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+---
+subcategory: "Relational Database Service (RDS)"
+---
+
+# flexibleengine_rds_backups
+
+Use this data source to get the list of RDS backups.
+
+## Example Usage
+
+```hcl
+variable "instance_id" {}
+
+data "flexibleengine_rds_backups" "test" {
+  instance_id = var.instance_id
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `region` - (Optional, String) Specifies the region in which to query the data source.
+  If omitted, the provider-level region will be used.
+
+* `instance_id` - (Required, String) Specifies the DB instance ID.
+
+* `name` - (Optional, String) Specifies the backup name.
+
+* `backup_id` - (Optional, String) Specifies the backup ID.
+
+* `backup_type` - (Optional, String) Specifies the backup type. The options are as follows:
+  - **auto**: Automated full backup.
+  - **manual**: Manual full backup.
+  - **fragment**: Differential full backup.
+  - **incremental**: Automated incremental backup.
+
+* `begin_time` - (Optional, String) Specifies the start time for obtaining the backup list.
+  The format of the start time is "yyyy-mm-ddThh:mm:ssZ".
+
+* `end_time` - (Optional, String) Specifies the end time for obtaining the backup list.
+  The format of the end time is "yyyy-mm-ddThh:mm:ssZ" and the end time must be later than the start time.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The resource ID.
+
+* `backups` - Backup list. For details, see Data structure of the Backup field.
+  The [backups](#rds_backups) structure is documented below.
+
+<a name="rds_backups"></a>
+The `backups` block supports:
+
+* `id` - Backup ID.
+
+* `instance_id` - RDS instance ID.
+
+* `name` - Backup name.
+
+* `type` - Backup type. The options are as follows:
+  - **auto**: Automated full backup.
+  - **manual**: Manual full backup.
+  - **fragment**: Differential full backup.
+  - **incremental**: Automated incremental backup.
+
+* `size` - Backup size in KB.
+
+* `status` - Backup status. The options are as follows:
+  - **BUILDING**: Backup in progress.
+  - **COMPLETED**: Backup completed.
+  - **FAILED**: Backup failed.
+  - **DELETING**: Backup being deleted.
+
+* `begin_time` - Backup start time in the "yyyy-mm-ddThh:mm:ssZ" format.
+
+* `end_time` - Backup end time in the "yyyy-mm-ddThh:mm:ssZ" format.
+
+* `associated_with_ddm` - Whether a DDM instance has been associated.
+
+* `datastore` - The database information. The [datastore](#rds_datastore) structure is documented below.
+
+* `databases` - Database been backed up. The [databases](#rds_databases) structure is documented below.
+
+<a name="rds_datastore"></a>
+The `datastore` block supports:
+
+* `type` - DB engine. The value can be: **MySQL**, **PostgreSQL**, **SQLServer**.
+
+* `version` - DB engine version.
+
+<a name="rds_databases"></a>
+The `rds_databases` block supports:
+
+* `name` - Database to be backed up for Microsoft SQL Server.

docs/data-sources/rds_engine_versions.md

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+---
+subcategory: "Relational Database Service (RDS)"
+---
+
+# flexibleengine_rds_engine_versions
+
+Use this data source to obtain all version information of the specified engine type of FlexibleEngine.
+
+## Example Usage
+
+```hcl
+data "flexibleengine_rds_engine_versions" "test" {
+  type = "SQLServer"
+}
+```
+
+## Argument Reference
+
+* `region` - (Optional, String) The region in which to obtain the RDS engine versions.
+  If omitted, the provider-level region will be used.
+
+* `type` - (Optional, String) Specifies the RDS engine type.
+  The valid values are **MySQL**, **PostgreSQL** and **SQLServer**, default to **MySQL**.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - Data source ID in hashcode format.
+
+* `versions` - Indicates the list of database versions. The [versions](#rds_versions) object structure is
+  documented below.
+
+<a name="rds_versions"></a>
+The `versions` block supports:
+
+* `id` - Indicates the database version ID. Its value is unique.
+
+* `name` - Indicates the database version number. Only the major version number (two digits) is returned.
+  For example, if the version number is MySQL 5.6.X, only 5.6 is returned.

docs/data-sources/rds_instances.md

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+---
+subcategory: "Relational Database Service (RDS)"
+---
+
+# flexibleengine_rds_instances
+
+Use this data source to list all available RDS instances.
+
+## Example Usage
+
+```hcl
+data "flexibleengine_rds_instances" "test" {
+  name = "rds-instance"
+}
+```
+
+## Argument Reference
+
+* `region` - (Optional, String) The region in which query obtain the instances. If omitted, the provider-level region
+  will be used.
+
+* `name` - (Optional, String) Specifies the name of the instance.
+
+* `type` - (Optional, String) Specifies the type of the instance. Valid values are:
+  **Single**, **Ha**, **Replica**, and **Enterprise**.
+
+* `datastore_type` - (Optional, String) Specifies the type of the database. Valid values are:
+  **MySQL**, **PostgreSQL**, and **SQLServer**.
+
+* `vpc_id` - (Optional, String) Specifies the VPC ID.
+
+* `subnet_id` - (Optional, String) Specifies the network ID of a subnet.
+
+* `enterprise_project_id` - (Optional, String) Specifies the enterprise project id.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The ID of the data source.
+
+* `instances` - An array of available instances. The [instances](#rds_instances) object structure is documented below.
+
+<a name="rds_instances"></a>
+The `instances` block supports:
+
+* `region` - The region of the instance.
+
+* `name` - Indicates the name of the instance.
+
+* `availability_zone` - Indicates the availability zone name.
+
+* `flavor` - Indicates the instance specifications.
+
+* `vpc_id` - Indicates the VPC ID.
+
+* `subnet_id` - Indicates the network ID of a subnet.
+
+* `id` - Indicates the ID of the instance.
+
+* `security_group_id` - Indicates the security group ID.
+
+* `param_group_id` - Indicates the configuration ID.
+
+* `enterprise_project_id` - Indicates the enterprise project id.
+
+* `fixed_ip` - Indicates the intranet floating IP address of the instance.
+
+* `ssl_enable` - Indicates whether to enable SSL.
+
+* `tags` - Indicates the tags of the instance.
+
+* `ha_replication_mode` - Indicates the replication mode for the standby DB instance.
+
+* `time_zone` - Indicates the time zone.
+
+* `private_ips` - Indicates the private ips in list.
+
+* `public_ips` - Indicates the public ips in list.
+
+* `status` - Indicates the DB instance status.
+
+* `created` - Indicates the creation time.
+
+* `db` - Indicates the database information. The [db](#rds_db) object structure is documented below.
+
+* `volume` - Indicates the volume information. The [volume](#rds_volume) object structure is documented below.
+
+* `backup_strategy` - Indicates the advanced backup policy. The [backup_strategy](#rds_backup_strategy) object structure
+  is documented below.
+
+* `nodes` - Indicates the instance nodes information. The [nodes](#rds_nodes) object structure is documented below.
+
+<a name="rds_db"></a>
+The `db` block supports:
+
+* `type` - Indicates the database engine.
+
+* `version` - Indicates the database version.
+
+* `port` - Indicates the database port.
+
+* `user_name` - Indicates the database username.
+
+<a name="rds_volume"></a>
+The `volume` block supports:
+
+* `size` - Indicates the volume size.
+
+* `type` - Indicates the volume type.
+
+* `disk_encryption_id` - Indicates the kms key id.
+
+<a name="rds_backup_strategy"></a>
+The `backup_strategy` block supports:
+
+* `start_time` - Indicates the backup time window.
+
+* `keep_days` - Indicates the number of days to retain the generated.
+
+<a name="rds_nodes"></a>
+The `nodes` block supports:
+
+* `id` - Indicates the node ID.
+
+* `name` - Indicates the node name.
+
+* `status` - Indicates the node status.
+
+* `role` - Indicates the node type.
+
+* `availability_zone` - Indicates the availability zone where the node resides.

docs/data-sources/rds_storage_types.md

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+---
+subcategory: "Relational Database Service (RDS)"
+---
+
+# flexibleengine_rds_storage_types
+
+Use this data source to get the list of RDS storage types.
+
+## Example Usage
+
+```hcl
+variable "instance_id" {}
+
+data "flexibleengine_rds_storage_types" "test" {
+  db_type    = "MySQL"
+  db_version = "8.0"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `region` - (Optional, String) Specifies the region in which to query the data source.
+  If omitted, the provider-level region will be used.
+
+* `db_type` - (Required, String) Specifies the DB engine type. Its value can be any of the following and
+  is case-insensitive: **MySQL**, **PostgreSQL**, **SQLServer**.
+
+* `db_version` - (Required, String) Specifies the database version. For details about how to obtain the database
+  version, see section [Querying Version Information About a DB Engine](https://docs.prod-cloud-ocb.orange-business.com/en-us/api/rds/rds_06_0001.html).
+
+* `instance_mode` - (Optional, String) Specifies the HA mode. The value options are as
+  follows: **single**, **ha**, **replica**.
+
+## Attribute Reference
+
+In addition to all arguments above, the following attributes are exported:
+
+* `id` - The resource ID.
+
+* `storage_types` - Indicates the DB instance specifications information list. For details, see Data structure of
+  the storage_type field. The [storage_type](#Storagetype_storageType) structure is documented below.
+
+<a name="Storagetype_storageType"></a>
+The `storage_type` block supports:
+
+* `name` - Indicates the storage type. Its value can be any of the following:
+  - **COMMON**: Indicates the SATA type.
+  - **ULTRAHIGH**: Indicates the SSD type.
+
+* `az_status` - The status details of the AZs to which the specification belongs.
+  Key indicates the AZ ID, and value indicates the specification status in the AZ.
+  The options of value are as follows:
+    - **normal**: The specifications in the AZ are available.
+    - **unsupported**: The specifications are not supported by the AZ.
+    - **sellout**: The specifications in the AZ are sold out.
+
+* `support_compute_group_type` - Performance specifications.
+  The options are as follows:
+    - **normal**: General-enhanced.
+    - **normal2**: General-enhanced II.
+    - **armFlavors**: Kunpeng general-enhanced.
+    - **dedicicatenormal**: Exclusive x86.
+    - **armlocalssd**: Standard Kunpeng.
+    - **normallocalssd**: Standard x86.
+    - **general**: General-purpose.
+    - **dedicated**: Dedicated, which is only supported for cloud SSDs.
+    - **rapid**: Dedicated, which is only supported for extreme SSDs.
+    - **bigmen**: Large-memory.