url: provide pathToFileURL and fileURLToPath

PR-URL: https://github.com/nodejs/node/pull/22506


Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>