test: add extended embedder cctest

Add an embedder cctest that also covers a multi-Environment situation,
including worker_threads-style inspector support.

Co-authored-by: Joyee Cheung <joyeec9h3@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/30467


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>