Update core-lib-gcp to use universal auth token requester, refactor mappers configuration(GONRG-4058)

Description:

Update core lib GCP, to use universal auth token requester. Refactor mappers configuration. Updated Readme.md

Changes include:

• Refactor (a non-breaking change that improves code maintainability).
• Bugfix (a non-breaking change that solves an issue).
• New feature (a non-breaking change that adds functionality).
• Breaking change (a change that is not backward-compatible and/or changes current functionality).

Changes in:

• GCP
• Azure
• AWS
• IBM

Dev Checklist:

• Added Unit Tests, wherever applicable.
• Updated the Readme, if applicable.
• Existing Tests pass
• Verified functionality locally
• Self Reviewed my code for formatting and complex business logic.

provider/legal-gcp/src/main/resources/application-anthos.properties

 partition-auth-enabled=false
-OSMDRIVER=postgres
-OBMDRIVER=minio
-OQMDRIVER=rabbitmq
\ No newline at end of file
+obmDriver=postgres
+osmDriver=minio
+oqmDriver=rabbitmq
\ No newline at end of file