Camera: Prevent setting non-uniform scale

[WestLangley]

This PR prevents setting non-uniform scale in cameras.

Currently, this is just a draft for discussion.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	365.31 86.78	365.31 86.78	+0 B +0 B
WebGPU	639.21 177.47	639.21 177.47	+0 B +0 B
WebGPU Nodes	637.33 177.18	637.33 177.18	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	497.82 121.45	497.94 121.48	+117 B +34 B
WebGPU	711.06 192.41	711.18 192.44	+117 B +32 B
WebGPU Nodes	660.28 179.65	660.39 179.68	+117 B +32 B

[Mugen87]

Related issue: #26659

Is this change required although #32805 is in place?

[WestLangley]

Is this change required although #32805 is in place?

TBH, since cameraMatrixWorldInverse is no longer guaranteed to be the inverse of cameraMatrixWorld, I am not sure.

For what use case is setting camera scale now required?

[Mugen87]

I can't think of a use case right now since normally if a camera is influenced by scaling, it's the scale from the world transform.

Could the PR updated so no (local) scaling is allowed?

[WestLangley]

Could the PR updated so no (local) scaling is allowed?

It can be, but I was thinking that would be overly-restrictive.

/ping @hybridherbst