Add thread safety static checker for TrkTrack
This adds the static thread safety checker.
TrkInfo were handled in different MRs
Here , there are still two remaining methods on so called persistification
that are used only by the TrackSlimmingTool.
There are marked explicitly as non thread safe (and now have to use a const_cast)
The alternative would have been to move these
methods and the
to the TrackSlimmingTool but @goetz preferred to keep them in place.