TrfTestsARTPlots: Add xAODCheckerTRFPlots.py to check PHYS/LITE file integrity
This MR adds xAODCheckerTRFPlots.py to the TrfTestsARTPlots package to check the DAOD_PHYS and DAOD_PHYSLITE output file integrity in 6 of the ART tests.
xAODCheckerTRFPlots.py is based on @jcatmore's xAODCheckerSummary.py from https://gitlab.cern.ch/jcatmore/xaod-scripts/-/tree/master and has been slightly modified and renamed to not clash in the future with a more official version of xAODCheckerSummary.py that might eventually be imported to the athena repository.
In the present state of the software the DAOD_PHYSLITE output files look fine according to xAODCheckerTRFPlots.py but there are several errors reported for the DAOD_PHYS files that should be followed-up separately as soon as these ART tests are up and running.