feat(hover): hover on schemas

[juleswritescode]

[juleswritescode]

i found some nameless roles in my local supabase database. Probably deleted?

select nspacl from pg_namespace where nspname = 'public' yielded:

{postgres=UC/postgres,anon=U/postgres,authenticated=U/postgres,service_role=U/postgres,=UC/postgres,airbyte=U/postgres,supabase_auth_admin=U/postgres}