Improve Point Cloud Performance with Custom Raycaster

[coderabbitai[bot]]

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There's a performance issue noted in regarding the default raycaster for point clouds being exceptionally slow. A TODO comment suggests implementing a custom raycaster to improve performance. This issue tracks the task of exploring and implementing a more efficient raycasting approach for point clouds.

File: TODO Comment:

Reference: https://github.com/voxel51/fiftyone/pull/3985#discussion_r1538173188