Similar to !51627 (merged), this adds an algorithm which decorates tracks with truth information. Two variables are added
truthOriginLabelwhich is an in integer origin defined here.
truthVertexIndexwhich is an integer label for the truth vertex from which the track originated. A value of
0is reserved for the truth PV, while other truth vertices in the event are indexed arbitrarily after sorting the tracks according to their pT. Truth vertices within a configurable distance (by default set to 0.1mm) are merged.
This moves functionality from the FTAG Training Dataset Dumper to speed up jobs. See atlas-flavor-tagging-tools/training-dataset-dumper#36 Jira: AFT-596