Nodes: Introduce static type

[sunag]

Related issue: #29187, #29250

Description

Introduce static type for Nodes.

• Added static type in Node and NodeMaterial
• Removed registerNode() from Node
• Removed registerNodeMaterial() from NodeMaterial
• NodeLoader, NodeObjectLoader and NodeMaterialLoader -- added .setNodes(), setNodeMaterials()
• Added instance method createMaterialFromType() in MaterialLoader

Making progress in tree shaking 🌳

[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	+64 B +8 B
WebGPU	819.3 kB 221.5 kB	821.4 kB 220.7 kB	+2.11 kB -800 B
WebGPU Nodes	818.8 kB 221.4 kB	821 kB 220.6 kB	+2.53 kB -698 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	565.4 kB 153.5 kB	522.1 kB 140.7 kB	-43.29 kB -12.87 kB
WebGPU Nodes	524.7 kB 143.9 kB	478.8 kB 130.5 kB	-86.64 kB -13.41 kB