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During wgsl lowering, if we encounter an external texture type then generate the `ExternalTextureParams` struct. This will be required by most Naga backends to implement external textures. This type is not actually used by wgsl-in or the IR. However, generating it in Naga IR ensures tricky details such as member alignment are handled for us. wgsl-out must ensure it does *not* generate code for this type, as it handles external textures natively.