Add table_privileges.list_direct RPC function

[Anish9901]

Fixes #3779

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[Anish9901]

@mathemancer, @pavish this PR is based on #3782, please merge #3782 before merging this PR.

[mathemancer]

Looks great! Easy peasy.

[mathemancer]

We're going to merge this and let @pavish review retroactively.