Placement and consolidation of CalorimeterHitType header (and source file)

[tmadlener]

The CalorimeterHitType header originally from MarlinUtil:

• CalorimeterHitType.h
• CalorimeterHitType.cc

has now landed (or is at least on the way of landing) in at least two repositories

• k4GaudiPandora: header, source file
• k4RecCalorimeter: Gaudi port of calorimeter digitisers used by ILD and MAIA HEP-FCC/k4RecCalorimeter#281

It's even slightly worse: the PR to k4RecCalorimeter introduces some small changes on top of the "copy" from MarlinUtil.

Purposes of this discussion

• Find a location for this commonly used thing
• Figure out where it is actually used and whether it can be replaced
• Check whether we still need all the "ILD"-isms that are partially baked in (e.g. the parsing of certain fields from strings / detector names).

Details that can be solved as part of the discussion

• The PR in k4RecCalorimeter, introduces an unknown enum state. However, it does so somewhat inconsistently with an already existing unknown state in another enum (see this discussion thread). We need to clarify whether harmonizing these is possible without issues and if so, do so.