Renderer: Make hasCompatibility() more predictable.

[Mugen87]

Related issue: -

Description

I think it's preferable if Renderer.hasCompatibility() behaves similar to hasFeature() and only reports a result after the backend has been initialized. Otherwise an error is returned.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	359.57 85.37	359.57 85.37	+0 B +0 B
WebGPU	626.83 174.23	626.97 174.23	+140 B +2 B
WebGPU Nodes	625.41 173.98	625.55 173.98	+140 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	491.31 119.78	491.31 119.78	+0 B +0 B
WebGPU	700.42 189.22	700.59 189.23	+170 B +7 B
WebGPU Nodes	649.63 176.58	649.8 176.59	+170 B +9 B