WebGPURenderer: sort bind groups and minimise setBindGroup() commands

[aardgoose]

As title.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	685.4 kB 169.7 kB	685.4 kB 169.7 kB	+0 B +0 B
WebGPU	821.7 kB 220.7 kB	822 kB 220.8 kB	+375 B +118 B
WebGPU Nodes	821.2 kB 220.6 kB	821.6 kB 220.7 kB	+794 B +210 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	462 kB 111.4 kB	462 kB 111.4 kB	+0 B +0 B
WebGPU	522.1 kB 140.7 kB	522.5 kB 140.8 kB	+375 B +124 B
WebGPU Nodes	478.7 kB 130.5 kB	479.1 kB 130.6 kB	-42.98 kB +121 B