Docs:: Add documentation for ClippingGroup.

[aardgoose]

Add a first draft documentation page for ClippingGroup.

Should ClippingGroup (and BundleGroup) be moved to src/objects with other Object3D subclasses?

Can some markup/labelling be applied to indicate that a feature is WebGPURenderer only.?

[Mugen87]

Should ClippingGroup (and BundleGroup) be moved to src/objects with other Object3D subclasses?

Yes, that sounds good to me.

Can some markup/labelling be applied to indicate that a feature is WebGPURenderer only.?

Until we find a solution, you can use a simple note under the description. We've used this approach for WebGL 2 only features as well. Maybe:

Note: ClippingGroup is only supported with WebGPURenderer.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	339.37 79.06	339.37 79.06	+0 B +0 B
WebGPU	477.43 132.37	477.43 132.37	+0 B -4 B
WebGPU Nodes	476.73 132.2	476.9 132.25	+171 B +46 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	464.82 112.02	464.82 112.02	+0 B +0 B
WebGPU	546.47 148.04	546.47 148.04	+0 B +0 B
WebGPU Nodes	502.35 137.74	502.35 137.74	+0 B +0 B