img2img for Latent Consistency Models

[arcanite24]

Is your feature request related to a problem? Please describe.
Add support for img2img on the LCM pipeline

Describe the solution you'd like
img2img support

[a-r-r-o-w]

I would like to work on this if it's open for grabs. I believe most of the implementation will be similar to txt2img LCM pipeline, but instead of random latents, they are passed after vae encoding the image + noise addition based on a strength parameter (similar to how the standard img2img sd pipeline works).

[patrickvonplaten]

Sure would be great if you give this a try @a-r-r-o-w !

[nagolinc]

I think this PR closes this: #5477

[github-actions]

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[patrickvonplaten]

Img2Img works for all LCM modles