Support RRefs that contain threading.Locks (#57943)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/57943
This is a common scenario (our own tutorials propose it), hence we should ensure it works.
A more generic solution is desirable, but this should fix the immediate concern.
ghstack-source-id: 132289683
Test Plan: Added a test
Reviewed By: mrshenli
Differential Revision: D28316076
fbshipit-source-id: 64e9766189f40474298876227ea247ce5b699d97
