[643] Add interface and models for synchronizing ACL policies

[vinishjail97]

Important Read

• Please ensure the GitHub issue is mentioned at the beginning of the PR

What is the purpose of the pull request

Adds interface and models for synchronizing ACL policies between source and target catalogs.

Brief change log

(for example:)

• Add models for role, user, user-group, privilege and securable-object
• Add InternalAccessControlPolicySnapshot to represent the policy snapshot for a catalog
• Add interface CatalogAccessControlPolicySyncClient

Verify this pull request

(Please pick either of the following options)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end.
• Added TestConversionController to verify the change.
• Manually verified the change by running a job locally.