GenerationActionInit: declare properties to access number of processed runs and events

Avoid having another level of quotes or b'' showing up in the wrong places

Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

Co-authored-by: Andre Sailer <andre.philippe.sailer@cern.ch>

`imp` was removed in Python 3.12.

Since 1.26 (ab9a96e6) we are seeing `ddsim` exceptions on certain Open Science Grid nodes/sites. Those sites appear to configure the running of singularity containers in such a way that no usernames are associated with the uid.

Everywhere but in Meta, where we want to allow adding arbitrary information

DDSim: OutputConfig: add forceLCIO, forceEDM4HEP, forceDD4HEP flags to force a specific output plugin

Move configuration to OutputConfig