Versioning of SDK

[kavilla]

Requirements:

• Define versioning mechanism for SDK
• Matrix and compatibility testing for OpenSearch Dashboards platform and SDK
• Matrix and compatibility testing for extension and SDK

[dblock]

The SDK itself should have its own versioning, follow semver, and ideally would be very broadly compatible with multiple major versions of OpenSearch Dashboards.

Per semver, if the SDK adds support for a new version of OpenSearch Dashboards, it's a minor version bump. If the SDK removes support for an existing version of OpenSearch Dashboards, it's a major version bump.

[kavilla]

Coming of this SDK should support multiple versions of OpenSearch as well for v1? And building out the interfaces.

Then v2 we can think about supporting different type of data sources.