Implement t::geometry::TriangleMesh::RemoveUnreferencedVertices

[nsaiapova]

The algorithm mimics the one in geometry::TriangleMesh::RemoveUnreferencedVertices. We first build a mask of vertices and then update all vertex attributes by that mask. Triangles are left untouched.

Type

• [ ] Bug fix (non-breaking change which fixes an issue): Fixes #
• [x] New feature (non-breaking change which adds functionality). Resolves #
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected) Resolves #

Motivation and Context

Implement missing method t::geometry::TriangleMesh::RemoveUnreferencedVertices. The method is defined in the legacy API.

Checklist:

• [x] I have run python util/check_style.py --apply to apply Open3D code style to my code.
• [x] This PR changes Open3D behavior or adds new functionality.
  • [x] Both C++ (Doxygen) and Python (Sphinx / Google style) documentation is updated accordingly.
  • [x] I have added or updated C++ and / or Python unit tests OR included test results (e.g. screenshots or numbers) here.
• [x] I will follow up and update the code if CI fails.
• [x] For fork PRs, I have selected Allow edits from maintainers.

Description

[update-docs[bot]]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.

[nsaiapova]

In the last push I also added "device" argument to tensor initialization in cpp tests.