Adding DRAW_EGZ CA style
This MR is to migrate the DRAW_EGZ configuration to component accumulator style (see https://its.cern.ch/jira/browse/ATLASRECTS-7425)
The ByteStream output writing configuration is "hand-made", using what is done there https://acode-browser1.usatlas.bnl.gov/lxr/source/athena/Event/ByteStreamCnvSvc/python/ByteStreamConfig.py#0100
This was tested in master, reading a DRAW_EGZ file from data16_13TeV.00311481.physics_Main.recon.DRAW_EGZ.r12746. The test file has 14 events, only 6 are selected. This might be due to a different reconstruction and identification (Medium, LHMedium for electrons, Tight for photons). However it has been checked that reading the produced BS file and rerunning DRAW kept all events.
I left the configuration python file in PrimaryDPDMaker but we could put it in DerivationFrameworkEGamma if this is more natural
tagging @jcatmore for review