Create a different library for Acts G4 Action

This MR create a different library containing the Acts G4 Action to help with the process of combining all libraries with Geant4 dependencies in Athena together (https://its.cern.ch/jira/browse/ATLASSIM-3150)

This MR also replace the extrapolator that was used previously by the Geant Follower by an extrapolation engine to have acces to the to material in the ATLAS traking geometry.

This also introduce a Geant following jobOption for the ITK.

It seems that at some point the old jobOption (running with ATLAS run2) has stop working : ReadCondHandle ERROR can't retrieve ( 'InDetDD::SiDetectorElementCollection' , 'ConditionStore+PixelDetectorElementCollection' ) via base class The error doesn't seem to affect the ITk one that use component accumulator so as soon as a particle gun are available with component accumulator I will update the jobOption and hope it will solve the issue.