TSL: Introduce automatic use of .toVar() to assign()

[sunag]

Related issue: #30849

Description

Introduces a variable intent module, which is a VarNode that is only activated if the Node is assigned. This allows nodes to be assigned without mandatory use of .toVar(). This was added to constant declaration, arithmetic, math and function call(Fn()).

// New
const foo = float( 1 );
floo.assign( 2 );

// Old
const foo = float( 1 ).toVar();
foo.assign( 2 );

• Introduce VarIntention - 48143a5
• Move builder.getArrayCount() -> node.getArrayCount() - 65b1b60
• Add NodeBuilder.flowBuildStage() - d06d498

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	337.92 78.83	337.92 78.83	+0 B +0 B
WebGPU	559.1 154.77	560.13 155.06	+1.04 kB +284 B
WebGPU Nodes	558.02 154.56	559.06 154.84	+1.04 kB +284 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	469.19 113.49	469.19 113.49	+0 B +0 B
WebGPU	634.4 171.77	635.3 171.98	+899 B +212 B
WebGPU Nodes	589.54 161.08	589.95 161.23	+412 B +153 B