Special treatment of beam pipe in DD4hepPlugin (was ACTS-393)

Original author Julia Hrdinka @jhrdinka

The existing geometry building tools are written in a generic way which allow building the detector from inside out automatically with given volume builders. They make automatic wrapping and therefore the volumes should be given in order. In case one of the inner volumes exceeds the outer volumes in length, which can only occur for the beam pipe, this volume needs special treatment and needs to be given to the geometry builders as the last volume.

This case will be solved in the DD4hep Plugin.