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Gaussian Splat rendering with WebGPU

One-file Gaussian Splat rendering using WebGPU (WIP).

This WebGPU implementation uses a compute-shader to extract the splats' parameters (position, axis, color) once for all.
The vertex shader generates a quad as triangle-strip.
The fragment shader has several 'visu' functions, other than the expected 'gaussian'. Try 'cone', it looks good too!
Supports Loose Octree front-to-back hierarchical frustum culling & sorting (from Gauss-Opt, including dropping .ply checkpoints with embedded octrees or .octree.json files), or CPU web-worker radix-sort + GPU incremental insertion-sort.

KNOWN BUGS / LIMITATIONS:

• z-sorting is imperfect, slow (see console with 'print timing'!), and produces flickering. The bottleneck is the writeBuffer() to send the sorted ids back to the GPU.
• No Spherical Harmonics for now.