Add support for enum config flags

Add support for enum config flags, port Input.Format and enable checks also for Common.ProductionStep.

The validation is done on lock and only touches flags that have enum assigned.

Tagging also @mhodgkin as I simplified some PFlow configuration now that the whole chain is running.

/cc @fwinkl @wlampl @tbold @goetz @jchapman @emoyse

Calorimeter/CaloRec/python/CaloRecoConfig.py

 
-# Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 
 from AthenaConfiguration.ComponentAccumulator import ComponentAccumulator
 from AthenaConfiguration.ComponentFactory import CompFactory
+from AthenaConfiguration.Enums import Format
 
-def CaloRecoCfg(configFlags, clustersname=None):
 
+def CaloRecoCfg(configFlags, clustersname=None):
     result = ComponentAccumulator()
-    if configFlags.Input.Format == 'BS':
+    if configFlags.Input.Format is Format.BS:
         #Data-case: Schedule ByteStream reading for LAr & Tile
         from LArByteStream.LArRawDataReadingConfig import LArRawDataReadingCfg
         result.merge(LArRawDataReadingCfg(configFlags))