TSL: Vertex shader revision

[sunag]

Related issue: #29555 (comment), #29659 (comment)

Description

The PR fixes the SpriteMaterial fog and brings some improvements related to MVP and Vertex.

• Fix fog in SpriteMaterial and SpriteNodeMaterial
• NodeMaterial: Add .setupPositionView()
• NodeMaterial: Add .setupVertex()
• modelViewProjection is a const now instead of a function like modelViewProjection()
• Add mediumpModelViewMatrix
• Rename highPrecisionModelNormalViewMatrix -> highpModelNormalViewMatrix
• Rename highPrecisionModelViewMatrix -> highpModelViewMatrix

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	339.21 79.01	339.21 79.01	+0 B +0 B
WebGPU	486.3 134.97	486.18 134.92	-123 B -54 B
WebGPU Nodes	485.76 134.87	485.64 134.82	-123 B -52 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.1 112.06	465.1 112.06	+0 B +0 B
WebGPU	555.41 150.39	555.32 150.35	-91 B -46 B
WebGPU Nodes	511.26 140.1	511.23 140.11	-30 B +5 B

[mrdoob]

Maybe we can follow use WebGL's lowp, mediump and highp?

lowpModelViewMatrix
mediumpModelViewMatrix
highpModelViewMatrix