[Feature] Image generation

[EchedelleLR]

It has been a while since stabledifussion model was integrated in LocalAI.

I would like to know if it would be possible to implement this in some way, maybe a check to change the action to image generation.

The own chat UI could be kept and it could be used to list pictures generated.

I think this is somewhat easy to implement. I could check some things. Aside this, maybe whisper would be the more challenging to keep this a simple UI.

Did not check if you are already working in the image generation though.