worker: allow URL in Worker constructor

The explicit goal is to let users use `import.meta.url` to
re-load thecurrent module inside a Worker instance.

Fixes: https://github.com/nodejs/node/issues/30780
PR-URL: https://github.com/nodejs/node/pull/31664


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>