Add decoding tests

This is intended as a starting point for the sub-detectors.

I took the liberty of adding some tests to run the decoding for the various subdetectors. I figured this is already in place for the RICH, so I didn't include that. They all pass for DetDesc and fail for DD4HEP with the error listed below. It's probably an issue with the tags, but I don't know which one makes sense.

ConditionsLoader                      ERROR +++ Load exception: cannot resolve object HEAD:Conditions/Rich2/Alignment/Global.yml: the path 'Global.yml' does not exist in the given tree

The input file is from the TestfileDB: upgrade-baseline-FT64-digi_retinacluster. For most test this is probably wrong, but again, intended as a starting point.

I think getting these to pass for DD4HEP after suitable updates to input files and database tags for individual tests would be an important milestone.

FYI: @lohenry @jmarchan @gbassi @mstahl