Texture compression on the web

[Davidster]

Currently, texture compression is only supported on native, no web. This is because the basis_universal rust crate doesn't support WASM. I currently have two ideas for solving this:

1. Store textures directly in BCN format on disk and skip the transcode step from basisu. This would work pretty well since BCN is supported on all desktop platforms. We can fallback on uncompressed textures if the BC webgpu feature is not available for the device I guess.
2. Try out https://github.com/expenses/basis-universal-rs. See issue Wasm support aclysma/basis-universal-rs#11 for more details.

Option 1) seems pretty good for now.