CaloRec: Allow CaloTopoClusterConfig to accept run arguments

After this MR, the user can simply set flags while running this configuration in the standalone mode, e.g.:

python -m CaloRec.CaloTopoClusterConfig Output.StorageTechnology="ROOTRNTUPLE"

The way things are coded, not all flags will be respected, e.g., maximum number of events, but that's out of the scope of this MR.

cc: @mnowak