Wire protocol over WebSockets

[chasers]

It should be easy for people to use Supabase with Vercel Postgres.

Adds support for the wire protocol over WebSockets such that the @vercel/postgres client works. See:
https://vercel.com/blog/vercel-storage#vercel-postgres-complex-data-made-easy

@vercel/postgres wraps @neondatabase/serverless which uses WebSockets to transport the wire protocol because some serverless envs like Cloudflare don't give you a TCP connection.

To use @neondatabase/serverless you need a proxy which handles WebSocket connections and turns it into a TCP Postgres connection.

The behavior of the proxy ultimately is here: https://github.com/neondatabase/wsproxy