Add SUPIR Upscaler

Model/Pipeline/Scheduler description

SUPIR is a super-resolution model that looks like it produces excellent results

Github Repo: https://github.com/Fanghua-Yu/SUPIR

The model is quite memory intensive, so the optimisation features available in diffusers might be quite helpful in making this accessible to lower resource GPUs.

Open source status

• The model implementation is available.
• The model weights are available (Only relevant if addition is not a scheduler).

Provide useful links for the implementation

No response