ComputeEffect: Implement onError callback

[Popov72]

See https://forum.babylonjs.com/t/computeshader-compilation-error-callback/48508

[bjsplat]

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To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
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[stefnotch]

Would it be possible to also provide the offset and length fields of the compile error messages?

Also, I just realised that if Babylon.js modifies the WGSL code, then the line number would be something unexpected that I couldn't easily map back.

[bjsplat]

Visualization tests for WebGPU (Experimental)
Important - these might fail sporadically. This is an optional test.

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14952/merge/testResults/webgpuplaywright/index.html

[bjsplat]

Visualization tests for WebGL 1 have failed. If some tests failed because the snapshots do not match, the report can be found at

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[bjsplat]

WebGL2 visualization test reporter:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/14952/merge/testResults/webgl2playwright/index.html

[Popov72]

@stefnotch See #14955