202203 Release
Change notes:
- add experimental pcm csv data plot and background collection scripts
- print 4 digits for MPI metrics
- uncore linux perf event robustness enhancements
- pcm-raw: additional overhead reduction for multi-group collection
- general overhead reduction (skip restoring thread affinity when not required)
- enhanced README for grafana setup
- pcm-numa, pcm-tsx: add -pid option
- fix compilation of examples on old gcc
- fix: restore affinity for caller process
- fixed race condition in resctrl (when not available)