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21.9: add optional additional truth info for SiHits in HitAnalysis

Christian Ohm requested to merge cohm/athena:21.9-HitAnalysis-add-optional-truth-info-to-SiHits into 21.9

This MR adds the possibility to write out info about the truth particle that created the SiHit:

  • PDG id
  • pT, eta, phi
  • (x,y,z) of its production vertex

Tagging @ncalace and @tstreble who might have thoughts about this. It seems to work well in my tests, though I only checked HGTD hits (where approximately 90% of the hits seem to not have a linked truth particle...). I'm not sure if this should also target master of that this package is too desynchronized in that branch wrt what we have in 21.9..?

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