Support Karras Pipeline on gen_img_diffusers.py

[geocine]

References

https://github.com/huggingface/diffusers/blob/main/examples/community/README.md#stable-diffusion-with-k-diffusion https://github.com/crowsonkb/k-diffusion

[kohya-ss]

I was not sure how to use k-diffusion with Diffusers, but it will be possible with the references. I will implement the feature 😀

[kohya-ss]

I checked the implementation of them, but it seems a little difficult to adapt them to the current pipeline. Because the pipeline is modified for some features. I will work on it when I have time.

[geocine]

No rush @kohya-ss this is just a suggestion