[RPC] waitForThreadLocalRRefs returns jitFuture (#51696)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51696
Modify this API to use JitFuture.
ghstack-source-id: 121695707
Test Plan: Ci
Reviewed By: mrshenli
Differential Revision: D26239132
fbshipit-source-id: 15c0c349a79e660fe4862e1d99176989f8159bf4
