add mesh vertex colours and normals #287
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Description
Add vertex colours and normals to the mesh message definition.
Is this user-facing behavior change?
Well, the new fields are optional, but the message hash changes, thus rendering previously stored messages (bag files) invalid.
Did you use Generative AI?
No. I know how to program :-)
Additional Information
See https://www.open3d.org/docs/latest/python_api/open3d.geometry.TriangleMesh.html for examples of what additional information a mesh may contain and https://github.com/naturerobots/mesh_tools/tree/main/mesh_msgs for prior art.