Adding monitoring metrics for PFlow track extrapolation (and related tools) (ATR-22226)
This merge request is part of my qualification task specified in this (https://its.cern.ch/jira/browse/ATR-22226) JIRA ticket. It adds some monitoring metrics to PFAlgorithm, PFCellLevelSubtraction, PFTrackClusterMatching, PFTrackSelector and TrackExtrapolator tool. These metrics are mostly related to timing, but there are added also performance-related metrics related to e.g. cluster matching efficiency which can be affected by the change in extrapolation performance. The reason for adding these metrics is to be able to quantify performance of track extrapolation step in PFlow algorithm.