Support KTX2 Basis Universal Texture Compression

[alexchuber]

We can currently read .ktx2 files-- included those compressed with Basis Universal-- but not create them.

• Add KTX2 compression option(s) to Inspector's Export tools extension

No longer planned:

• Add a KTX2 Encoder with the ability to compress textures using Basis Universal-- i.e., a complement to the existing @babylonjs/ktx2decoder

[github-actions]

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