WIP: lima/vecgeom-332 - Improvements to ShapeTester to enforce VecGeom vs. USolids conventions
Requesting merge to promote code review, as requested by @swenzel. Commits also include changes to the UnplacedVolumeImplHelper.h and SpecPlacedVolImplHelper.h, to introduce the differences in USolids conventions with respect to VecGeom conventions for points near surfaces.