NodeBuilder: More docs.

[Mugen87]

Related issue: #29984

Description

@sunag I have finalized the JSDoc for NodeBuilder however I was not able to document the flow, stack and chaining related logic to full extend (types and signatures are defined though). It would be great if you can revisit this bit at some point and resolve the TODOs.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	339.11 78.98	339.11 78.98	+0 B +0 B
WebGPU	484.6 134.48	484.6 134.47	+0 B -1 B
WebGPU Nodes	484.06 134.38	484.06 134.38	+0 B -1 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	464.62 111.98	464.62 111.98	+0 B +0 B
WebGPU	553.55 149.82	553.55 149.82	+0 B +0 B
WebGPU Nodes	509.43 139.53	509.43 139.53	+0 B -1 B