Integrate the new Reduced 3DGS paper

[aW4KeNiNG]

A recent paper by the original 3DGS authors presents methods to reduce the GS by 27x without sacrificing quality. You can find the paper here: Reduced 3DGS.

The paper introduces three key steps:

• Improved Pruning Strategy: this method reduces 60% of the splats, significantly boosting the framerate in viewers.
• Variable SH Degree: It can be adjusted for each splat.
• Utilization of Codebooks: this method optimizes the representation and storage of splats.

Additionally, they use half-precision in the ply file.

Maybe it can be replicated in OpenSplat and it could be implemented step by step independently at startup.