fix: respect rotation/position transformation in CAD_MultiVolume

This respects the specified rotation/position in xml such as:
```xml
  <detectors>
    <detector id="1" name="Shape_PLY_Wuson" type="DD4hep_TestShape_Creator">
      <check vis="Shape1_vis">
        <shape type="CAD_Shape" ref="${DD4hepExamplesINSTALL}/examples/DDCAD/models/PLY/Wuson.ply"/>
        <position x="30 * cm" y="30 * cm" z="30 * cm"/>
        <rotation x="0"  y="0"  z="0"/>
      </check>
      <test type="DD4hep_Mesh_Verifier" ref="${DD4hepExamplesINSTALL}/examples/DDCAD/ref/Ref_PLY_Wuson.txt" create="CheckShape_create"/>
    </detector>
  </detectors>
```