Followed "Raytracing in a Weekend" books and at some pointed ported them to WebGPU. Rays are path-traced in a compute shader, bouncing around the scene and acc

Followed "Raytracing in a Weekend" books and at some pointed ported them to WebGPU. Rays are path-traced in a compute shader, bouncing around the scene and accumulating color. The frame renders are accumulatively added to achieve denoising and blitted to the device screen. This provides for interactive framerates in the demo.