Is this a new feature, an improvement, or a change to existing functionality?

New Feature

Feature Description

The URDF Xml object will refer to STL files by path. We need to locate & parse these files into UsdGeomMesh using numpy-stl

Additional context or alternatives

No response

Code of Conduct

• I agree to follow urdf-usd-converter Code of Conduct
• I have searched the open issues and have found no duplicates