WebGLRenderer: Auto-correct reversed projection matrix

[WestLangley]

Currently, reversed depth buffer is set globally, and not on a per-camera basis. I think that is reasonable.

Since there are many cameras used by the engine that the user does not have access to, just auto-correct camera.reversedDepth upon first-use.

I think camera.reversedDepth can be made private, as the property would only be used by the engine itself.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.28 78.93	338.01 78.83	-271 B -98 B
WebGPU	558.52 154.58	558.52 154.58	+0 B +0 B
WebGPU Nodes	557.45 154.37	557.45 154.37	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	469.62 113.66	469.2 113.5	-426 B -158 B
WebGPU	634.18 171.62	634.18 171.62	+0 B +0 B
WebGPU Nodes	589.31 160.95	589.31 160.95	+0 B +0 B

[WestLangley]

In the examples, sometimes the renderer is instantiated prior to the camera, and sometimes the camera is instantiated prior to the renderer.

In that regard, I think having the renderer auto-correct the projection matrix lazily, upon first use, is a reasonable approach.

[WestLangley]

Merging this for now...

At the appropriate time, camera.reversedDepth can become camera._reversedDepth, since users will no longer be expected to set it.

/ping @sunag