Write EventTags to TTRee/RNTuple depending on where EventData goes
Adding RNTuple-based APR Collection implementation. The functionality covers Athena writing and reading and stand-alone Collections utility reading. Stand-alone writing may be added later (or not).
In Athena, switching to RNTuple for EventData StorageTech will also cause EventTags to be written to RNTuple.
Work in the scope of ATEAM-933
Edited by Marcin Nowak