Integrate Flash-kmeans for GPU based k-means

[praveenpenumaka]

There is a new Flash k-means algorithm which performs better with GPU. I think we should consider using it for splat-transform replacing the current version which is segfault prone based on size.

https://github.com/svg-project/flash-kmeans

They have only python library for now.

[MAP233224]

Is this why I'm getting this error? The original .ply has 4M splats, and I ran -F 8192.

opacity pruning: 4000000 -> 3166563 splats (threshold=0.1000)
merging iteration: 3166563 -> 8192 splats
RangeError: Set maximum size exceeded
    at Set.add (<anonymous>)
    at simplifyGaussians (file:///C:/Users/Utilisateur/AppData/Roaming/npm/node_modules/@playcanvas/splat-transform/dist/cli.mjs:12778:29)
    at processDataTable (file:///C:/Users/Utilisateur/AppData/Roaming/npm/node_modules/@playcanvas/splat-transform/dist/cli.mjs:20097:26)
    at file:///C:/Users/Utilisateur/AppData/Roaming/npm/node_modules/@playcanvas/splat-transform/dist/cli.mjs:20835:33
    at async Promise.all (index 0)
    at async main (file:///C:/Users/Utilisateur/AppData/Roaming/npm/node_modules/@playcanvas/splat-transform/dist/cli.mjs:20813:34)
    at async file:///C:/Users/Utilisateur/AppData/Roaming/npm/node_modules/@playcanvas/splat-transform/bin/cli.mjs:5:1