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..?