Gcp support open vds (GONRG-1425)

Description:

• GCP: Introduce DownScopedCredentialsService which provides DownScopedCredentials to support OpenVDS case.
• GCP: Uses new service in the GCP GoogleCloudStorageServiceImpl to provide DownScoped token as a value of the SignedUrl.connectionString for OVDS resources
• Common: Added an endpoint POST /v1/files/downloadURL to support requests of multiple files in one request.
• SonarLint fixes
• Extend downloadURL response with additional optional connectionString properties to support OpenVDS case:

[{
                "signeUrl": 
                "unsignedUrl": "gs://osdu-cicd-file/my-vds",
                "kind": "osdu:osdu:vds:0.3.0",
                "connectionString": "token.,,,,qweqwe21dqwd"
}]

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.