Add new pg_bm25 full-text-search postgres extension

A new, powerful full-text-search extension for postgres has been released recently called [pg_bm25](
I think it would be a huge benefit to add support for this new interesting extension to the supabase environment (docker image & cloud).

Besides the basic [pg_bm25]( extension, there's also the [pg_search]( extension to combine bm25 with vector searches which would probably make sense to add as well.