[Tensorpipe Agent] Base Structs for Tracking RPC Metrics (#37850)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37850
Adding the base structs for tracking time-series metrics in the Tensorpipe RPC Agent
ghstack-source-id: 103528373
Test Plan: CI
Differential Revision: D21339520
fbshipit-source-id: 8334044cdded44a940800c1d1f14d07ffab1a7e2
