[LTC] Upstream utils in computation_client (#69621)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69621
Upstream the following utils
- metrics.h
- multi_wait.h
- thread_pool.h
- unique.h
Test Plan: Imported from OSS
Reviewed By: wconstab, VitalyFedyunin
Differential Revision: D32957629
Pulled By: desertfire
fbshipit-source-id: 5f2fb57493856556099b7cda7560a568d1f9ed97
