Implement databases.privileges.transfer_ownership RPC endpoint

[Anish9901]

Fixes #3774

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[pavish]

@Anish9901 This looks great!

I'd like this RPC method to return the same result as databases.get which returns owner_id and information of current role's access, since the frontend will need it once the request succeeds.

[pavish]

Looks good! Nice work!