Warn about missing dependency, but only once

[RaananW]

When the Ray import is missing no warning is shown when using the pick function (which is part of the default scene behavior).

This will display a single warning if Ray is not impoted. It also extends the warning mechanism to allow to throw/warn only once.

[RaananW]

See https://forum.babylonjs.com/t/pickedmesh-is-null-in-onpointerobservable-after-update-to-6-25-0/45076

[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]

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