WebGPUBindingUtils: Improve Bind Group Layout cache system.

[Mugen87]

Related issue: #32249

Description

Third attempt of improving the bind group layout system.

The deletion runtime error has been fixed with this PR and some additional refactoring has been done in WebGPUBindingUtils to simplify things. Hopefully, this should be good now.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	350.43 83.06	350.43 83.06	+0 B +0 B
WebGPU	614.74 170.7	615.47 170.89	+737 B +188 B
WebGPU Nodes	613.34 170.44	614.08 170.63	+737 B +185 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	482.47 117.86	482.47 117.86	+0 B +0 B
WebGPU	686.07 186.47	686.81 186.65	+737 B +183 B
WebGPU Nodes	635.91 173.66	636.65 173.84	+737 B +182 B

[cmhhelgeson]

@Mugen87 Sorry I couldn't get to this earlier, I've been dealing with some health issues. I assume the issue was solved by just setting bindingsData.layout = undefined, which invalidates the deletion block?

[Mugen87]

It was the additional if check:

if ( bindingsData.layout ) {