Request to add discriminator based guidance

Would it be possible to get discriminator based guidance from the paper "Refining Generative Process with Discriminator Guidance in Score-based Diffusion Models" that was published at ICML'23.

Paper link: https://proceedings.mlr.press/v202/kim23i/kim23i.pdf

Thanks,
Anubhav

Start by reading the linked ICML'23 paper and comparing its discriminator-guidance method with the diffusion guidance APIs in this repository. The issue names no target pipeline, implementation file, or test; completion criteria would need to define the supported model and demonstrate the method with tests or an example.

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