TrkQual BDT

[AndrewEdmonds11]

This PR goes with Mu2e/ArtAnalysis#7. Once this PR is merged, there will be two trkqual branches:

• trkqual contains the ANN result
• trkqual2 contains the BDT result

UPDATE 2026-07-24:
This PR goes with Mu2e/ArtAnalysis#7. Once this PR is merged, there will be two trkqual branches:

• trkqual contains the ANN result
• trkqual_bdt contains the BDT result

The following features have been added:

• trkqual branches can have arbirary names,
• trkqual metadata (version number, input tag) is stored in a histogram
  • you can check this using the checkEventNtuple script
  • you can require a specific model version in RooUtil analysis script using util.RequireTrkQualMetadata (see rooutil/examples/CompareTrkQualTrainings_UserBranches.C)
• RooUtil can better support run-time defined branches with the new UserBranch (should resolve RooUtil can only handle two trkqual branches and one mcsteps branch #306)