Update grants and add an ID field of some sort

[kiwicopple]

https://github.com/supabase/pg-api/blob/c53dfaf2948d04e3baa267400f793aa3233f84ea/src/lib/interfaces/roles.ts#L18

Is there an internal PG ID that we can use for grants? We need this to update the permissions when we start doing RLS

[soedirgo]

I don't think there's an OID for "grants", but looking at this, it's possible to get OIDs for a grantee-grantor-privileges relation.

pg_class docs
Another related SO thread

[kiwicopple]

I think that makes sense - we want to be updating the permissions on this more granular level. Let's return grantee-grantor-privileges for the grants array