Provide an easy way to interrupt the Geant4 event loop and end a run

Provide an easy way to interrupt the Geant4 event loop and end a run from within an event simulation (i.e., during the BeginOfEventActions, or PrimaryGeneratorAction)

Voiced by ATLAS Contacts: Michael Duerhrseen-Debling, Martina Javurkova, Marilena Bandieramonte

See page 10 of Marilena's talk: https://indico.cern.ch/event/1554191/contributions/6712279/attachments/3157573/5609056/20241020_OpenAndNewRequirementsHeP_MBandieramonte.pdf