Introduce DetDesc implementation of ConditionAccessorHolder concept
This is a new way of retrieving conditions and detector elements from the detector transient store.
The interface has been designed and implemented during the 15th Hackathon for Upgrade.
Only the DetDesc backend is implemented. The DD4hep one will follow.
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fix interoperability issue with the old way -
modify declaration of derived conditions to be closer to the DD4hep API -
add Doxygen comments
Note: includes !1791 (merged)
Edited by Marco Cattaneo