Support propagating UV coordinates for Mesh simplification

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](https://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](https://www.open3d.org/docs/release/) and the [latest documentation](https://www.open3d.org/docs/latest/) (for `main` branch).

### Proposed new feature or change

SimplifyQuadricDecimation() and SimplifyVertexClustering() ignore UV coordinates. These or alternate mesh simplification methods should support propagating UV coordinates to enable texture mapping with the resulting mesh.

### References

_No response_

### Additional information

_No response_