chore(docs): add sqlc-gen-better-typescript plugin to community page

[eikster-dk]

Add eikster-dk/sqlc-gen-better-typescript (https://github.com/eikster-dk/sqlc-gen-better-typescript) to the language support reference.

This project contains two sqlc WASM plugins backed by a shared toolbelt package:

• Native TypeScript -- generates plain async functions with Zod validation and a SqlClient interface
• Effect v4 -- generates repository services using effect/unstable/sql and Effect Schema
• Both plugins support PostgreSQL only.

Changes

• Added TypeScript entry under Community language support (as a plugin)
• Added Effect v4 entry under Community projects (as a non-traditional language target)
• Widened the table columns to accommodate the new plugin name