TSL: Add .load() function to texture()

[sunag]

Description

Alternative to textureLoad().
Equivalent to what we use with texture().sample(), now with texture().load().

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.37 78.9	338.37 78.9	+0 B +0 B
WebGPU	561.84 155.42	561.89 155.44	+45 B +13 B
WebGPU Nodes	560.45 155.18	560.49 155.19	+45 B +13 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	469.75 113.6	469.75 113.6	+0 B +0 B
WebGPU	636.57 172.28	636.62 172.29	+45 B +16 B
WebGPU Nodes	591.22 161.5	591.26 161.52	+45 B +16 B

[mrdoob]

How about sampleNearest() instead?

[sunag]

How about sampleNearest() instead?

I'm not sure yet if it's the best name, the function is closer to textureLoad(), as it doesn't use sampling, it's uv[x][0-width](u32) instead of uv[x][0-1](f32).

Edit: Maybe pixel() or get() 🤔...

[mrdoob]

read(), readTexel(), fetch(), fetchTexel(), ... ?