inspector: JavaScript bindings for the inspector

PR-URL: https://github.com/nodejs/node/pull/12263


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Josh Gavant <josh.gavant@outlook.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>