WIP: Get the particle information from Geant4 simulation

This builds on !214 (merged), and uses the FW::SimHitContainer to store information from the Geant4 particle in the GeantinoRecordingExample. The Geant4 MMEventAction and MMSteppingAction are modified to read out the position, time, and 4-mom of at each G4Step per track and stored in the SimHitContainer. The RootSimHitWriter is added to the GeantinoRecordingExample to read and write out the information stored in the SimHitContainer per every G4Event.