Add shadow support

[alexandremottet]

In the viewer, add the support for :

• shadow map,
• ibl shadows
• shadow quality selection normal, high

For now, ibl shadows are dissabled for meshes that have animations in WebGPU even if the animation is paused as there is some issues.

The auto shadow selection will come in another PR.
The placement of the light will come in another PR.

[bjsplat]

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

[bjsplat]

Reviewer - this PR has made changes to one or more package.json files.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Reviewer - this PR has made changes to one or more package.json files.

[bjsplat]

Snapshot stored with reference name:
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https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16459/merge/index.html

To test a playground add it to the URL, for example:

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Links to test babylon tools with this snapshot:

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WebGL2 visualization test reporter:

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Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16459/merge/testResults/webgpuplaywright/index.html

[bjsplat]

Reviewer - this PR has made changes to one or more package.json files.

[bjsplat]

Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16459/merge/testResults/webgpuplaywright/index.html

[bjsplat]

WebGL2 visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16459/merge/testResults/webgl2playwright/index.html

[bjsplat]

Reviewer - this PR has made changes to one or more package.json files.

[bjsplat]

Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16459/merge/testResults/webgpuplaywright/index.html

[bjsplat]

WebGL2 visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/16459/merge/testResults/webgl2playwright/index.html

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Reviewer - this PR has made changes to one or more package.json files.

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Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

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Reviewer - this PR has made changes to one or more package.json files.