Throw error in CSG when adding a mesh that lacks indices, positions or normals

[rapid-images-tore-levenstam]

Small issue found, where Babylon reads from a null array. Added some checks that throw more descriptive errors and adjusted the typing as well to better represent the data usage.

[bjsplat]

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[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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[bjsplat]

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[bjsplat]

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