Add CA-based skeletons for HITSMerge and RDOMerge

Tadej Novakrequested to merge
tadej/athena:trf/merge-skeleton into master

Add CA-based skeletons for HITSMerge and RDOMerge. Also move RDOMerge under simulation domain.

This MR also adds common handling of the detector configuration for simulation transforms and fixes some import issues.

/cc @jchapman @goetz @mhodgkin

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