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RootAuxDynIO: Better sync RNTuple field names with TTree branch names

Alaettin Serhan Mete requested to merge amete/athena:main-rntuple-fieldname-update into main

This MR aims to better align the RNTuple field names for dynamic attributes with the TTree branch names. Right now, a branch we write in TTree named, e.g., AnalysisJetsAuxDyn.pt, is written as AnalysisJetsAux::pt in RNTuple. With this MR, the latter becomes AnalysisJetsAuxDyn:pt. In general, RNTuple doesn't allow dot characters in field names. Therefore, for now we stick to colon as the delimiter.

cc: @gemmeren, @mnowak

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