Mock "timers/promise" module

[fatso83]

In #467 @swenzel-arc added the support for the timers module in NodeJS. Node also exports a non-callback async/Promise version of that API that needs to be mocked. We can probably very easily piggy-pack on top of the existing work done in the referenced PR.

Also see the over-arching #418

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[KholdStare]

Not stale

[benjamingr]

This can be closed 🎉