Implement database_privileges.get_owner_oid_and_curr_role_db_priv RPC endpoint

[Anish9901]

Fixes #3735

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[Anish9901]

@pavish can you tell me why do we need owner_oid in the response and how are we going to use it?

[pavish]

@Anish9901 The owner information is displayed on the UI when checking/modifying permissions and transferring ownership. It is also needed to check if certain functionalities are supported such as dropping the object.

The information of the owner i.e. owner_oid and the current role's access permissions are needed at every level, database, schema, and tables. In schema and tables, these can be in the response in the list endpoint. For databases, we would require connecting to each db to query it inorder to make it a part of the list endpoint. Inorder to avoid that, I added a different endpoint called get_basic. I've mentioned this as a comment on a comment in the issue.

I assume you would like to rename it to get_curr_role_priv and trying to avoid owner_oid there. I would suggest against it and either prefer get_basic as the name or something else that denotes that the endpoint also contains the owner information.

[mathemancer]

Code looks fine. Once @pavish is happy, I'm happy.

[pavish]

Looks great to me!