Extend BuildTruthTau to decorate Tau with prod/decay vertex (v2)
Cleaned copy of !65225 (closed) without mixing main and 23.0
This MR is meant to add the Truth tau decay/production vertex information among the info available in the TruthTau container. If it's possible (and time) allows, this MR should go in for the imminent PHYS production.
For long term (next PHYS production) we plan also to add the four-momentum of the tau decay products as this is needed/requested to run the TauSpinner algorithm used by some ATLAS analyses for tau spin related studies