WebGPURenderer: Added tone-mapping/output color space support for WebXR.

[sunag]

Related issue: #30459 (comment)

Description

Add tone-mapping and output color space support for WebXR.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.42 78.33	336.42 78.33	+0 B +0 B
WebGPU	517.95 143.9	518.03 143.92	+82 B +21 B
WebGPU Nodes	517.41 143.79	517.5 143.81	+82 B +21 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.41 112.17	465.41 112.17	+0 B +0 B
WebGPU	589.82 160	589.91 160.02	+82 B +22 B
WebGPU Nodes	545.19 149.54	545.27 149.56	+82 B +21 B