[Tensorpipe Agent] Add Call Counts to Metrics (#38266)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38266
Add the client/server active and async call counters to the
Tensorpipe Agent metrics.
ghstack-source-id: 103949985
Test Plan: CI
Reviewed By: lw
Differential Revision: D21509236
fbshipit-source-id: 66277f44d974c929a65e87bd270222d0ae27395e
