21.2 BTagging object augmenter tool with SMT muon information

Following recipe from @dguest and starting from recent merged changes.

This tool adds aux data to the BTagging object about muon in jet observables to be used by the FTAG new soft muon tagger currently being developed.

I'm leaving this as WIP in the moment so that @dguest can take a look. EDIT: After iterating with Dan, seems ready to be reviewed.