TSL: Avoid name collision

[sunag]

Fixes: #29969

Description

Automatically renames the property if the name is already in use.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.08 78.29	336.08 78.29	+0 B +0 B
WebGPU	526.44 146.68	526.82 146.82	+384 B +139 B
WebGPU Nodes	525.91 146.58	526.29 146.72	+384 B +139 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.15 112.18	465.15 112.18	+0 B +0 B
WebGPU	598.64 162.71	599.02 162.86	+384 B +146 B
WebGPU Nodes	553.72 152.18	554.1 152.32	+384 B +145 B