Added algorithm to store bare pixel hits in xAOD container

This algorithm is to copy the PixelHits from RDO to xAOD compliant form. Also the CA generator is added. It schedules the copier & configures recording in output ESD & AOD files.

Tagging co-coders @fpastore @mvgonzal @mastrand Also tagging @tstreble for question. There is an associated py file with CA configuring this alg and we need home for it. Here is good?

This is related to initial TV preparation for EFTracking: EFTRACK-63