update_geometry for Open3D scene

[richardrl]

Checklist

• I have searched for similar issues.
• For Python issues, I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for main branch).

Proposed new feature or change

I am building a custom UI which includes a 3D scene. This is why I am using the Open3DScene class instead of Scene class.

However, the former does not have update_geometry for pointclouds. I assume this makes things slow. Can we add update_geometry?

References

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Additional information

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[richardrl]

Open3DScene superclasses Scene, so you just need to unpack the instance of Open3DScene