ComponentAccumulator: remove private member access and add getCondAlgos

Frank Winklmeierrequested to merge
fwinkl/athena:acc_private into 23.0

Reduce the access to private members of the ComponentAccumulator class in various places. Also introduce public getCondAlgos API and cleanup implementation of getCondAlgo.

This is preparatory work in trying to speed up the copy of the CA class.

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