Introduce debug and trace log levels in c10d (#73167)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73167
This PR adds `C10D_DEBUG` and `C10D_TRACE` macros to enable fine grained logging in c10d. It also updates some log statements of `socket` to make its output less noisy.
ghstack-source-id: 149778567
Test Plan: Manual testing with different socket conditions.
Reviewed By: rohan-varma
Differential Revision: D34371426
fbshipit-source-id: a852b05ec353b18b0540ce5f803666c3da21ddd7
(cherry picked from commit 4519b06ac57f177dfc086bc10e8e1a746ba0870d)
