Webgl for SplatData Transformations

[TravisThomp]

Update SplatData to utilize fragment shader to calculate the matrix transforms, scales, and rotations. Currently CPU bound and slow :(

[dylanebert]

Noting here that object-level transformations are already applied in the vertex shader: https://github.com/huggingface/gsplat.js/blob/main/src/renderers/webgl/programs/RenderProgram.ts

However for per-point changes, yes, currently CPU-bound and could use improvement