[enhancement]: Investigate using `spandrel` for upscaling and image restoration

[psychedelicious]

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What should this feature add?

spandrel is a module extracted from the chaiNNer project that facilitates loading and running ML models. The focus is on image restoration workflows. Many architectures are supported. A1111 uses this in some fashion.

We should explore leveraging this library to extend our upscaling capabilities.

Alternatives

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Additional Content

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