Handle and parse env variables of type "array" in the config service

[natanasow]

Problem

Currently, there is no mechanism to parse and use environment variables from the type "array." They are used as plain strings, and they are explicitly parsed on each call/usage.

Solution

• add a new case for type "array" here https://github.com/hashgraph/hedera-json-rpc-relay/blob/main/packages/config-service/src/services/validationService.ts#L59
• fix all places where JSON.parse is being called on a plain string but the env variable is defined as an "array" in the globalConfig.ts

Alternatives

No response