Use copyid of Volume in Vecgeom to group the volumes in scorer
In Vecgeom, all placed volumes are associated with a constant copyid. Experimentally, in v2, the Volume class const_cast the const key, and modifies the volume copyid by force. In the view of Prompt, copyid is considered as the groupID. All scorers should have the access to the groupID. They scorers only if the groupID satisfied the conditions when creating the scorer.
groupid should become a common keyword for scorers in the scorer factory.