Make it possible to copy a RaycastingScene

[elias-Mimetrik]

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

Right now, the RaycastingScene object contains a unique_ptr, which prevents making copies of it.

In my application I have to add the same objects to the scene each iteration. It would much more efficient if I deep copied a RaycastingScene object in memory.

See L253 here: https://www.open3d.org/html/cpp_api/_raycasting_scene_8h_source.html

References

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Additional information

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