fix: remove pg-meta dep by embedding required logic

[gregnr]

A number of Windows-related issues are due to a build issue on libpg-query, which is a nested dependency of pg-meta.

This PR cherry picks the logic we need from pg-meta (list tables & list extensions) and embeds it into this server so that we no longer need to depend on pg-meta. In the future, we will replace this logic completely with supastructure.