lib: add `navigator.hardwareConcurrency`
I'm following up on an abandoned pull request, and adding authors as the co-author to this pull request.
I've simplified and only added navigator.hardwareConcurrency
right now, to receive feedback, understand any blockers before investing more time on it.
Referencing issue: https://github.com/nodejs/node/issues/39540 Follow up of the pull request: https://github.com/nodejs/node/pull/39581