Add Replicate demo and API

[zsxkib]

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Hi @cszn!

Awesome work on BSRGAN!

This pull request makes it possible to run BSRGAN on Replicate (replicate.com/zsxkib/BSRGAN) and via API!

I tweeted about this model on Twitter/X too https://x.com/zsakib_/status/1884618346668212343