Live Share: Connect to in-browser PGlite with any Postgres client

Supabase added Live Share to database.build, enabling users to connect to in-browser PGlite databases from external Postgres clients via a unique connection string.

• The feature uses a websocket-to-tcp proxy and pg-gateway to relay Postgres wire protocol messages.
• PGlite has a single-connection limit, so only one client can connect at a time.