WebGPURenderer: cache textureViews for reuse in bindGroup

[aardgoose]

As title.

Reduces duplicate textureView creation (webgpu_performance example from over 5000 textureViews to less than 200).

Also reordered to remove unrequired dimension selection from video texture path.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Filesize dev	Filesize PR	Diff
WebGLRenderer	685.4 kB (169.7 kB)	685.4 kB (169.7 kB)	+0 B
WebGPURenderer	818.6 kB (221.2 kB)	818.7 kB (221.3 kB)	+64 B

🌳 Bundle size after tree-shaking

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

	Filesize dev	Filesize PR	Diff
WebGLRenderer	462 kB (111.4 kB)	462 kB (111.4 kB)	+0 B
WebGPURenderer	564.8 kB (153.4 kB)	564.9 kB (153.4 kB)	+64 B

[sunag]

Hmm.. this broken webgpu_compute_audio example.