Add PAG support to SD1.5

[yiyixuxu]

We recently integrated PAG into diffusers! See this PR [here] (https://github.com/huggingface/diffusers/pull/7944) we added PAG to SDXL

we also want to add PAG support to SD1.5 pipelines! we will need:

• [x] StableDiffusionPAGPipeline (assigned to @shauray8, PR https://github.com/huggingface/diffusers/pull/8725)
• [ ] StableDiffusionPAGImg2ImgPipeline (assigned to @sajadn )
• [ ] StableDiffusionPAGInpaintPipeline (assigned to @blaisedmello )
• [ ] StableDiffusionControlNetPAGPipeline (assigned to @tuanh123789 )
• [ ] StableDiffusionControlNetPAGImg2ImgPipeline (assigned to @Bhavay-2001 )

1. You should put it under the pag folder
2. you can use the implementation of SDXL PAG pipelines as a reference (see this PRhttps://github.com/huggingface/diffusers/pull/7944 and you can find all the sdxl pag pipelines here https://github.com/huggingface/diffusers/tree/main/src/diffusers/pipelines/pag)
3. you need to add AutoPipeline so that you can use this API to create it

      AutoPipelineForImage2Image.from_pretrained(repo_id, controlnet=controlnet, enable_pag=True ...)

4. tests and docs

If you are interested in working on this, Let me know which pipeline(s) you want to work on:)

[blaisedmello]

Hello, I would like to have a go at it. Can I work on the StableDiffusionPAGInpaintPipeline?

[yiyixuxu]

@blaisedmello sure!

[shauray8]

Looks rather interesting, adding support for StableDiffusionPAGPipeline.

[sajadn]

Hey, I'll work on StableDiffusionPAGImg2ImgPipeline

[tuanh123789]

Hi, can i take StableDiffusionControlNetPAGPipeline

[yiyixuxu]

@tuanh123789 sure!

[Bhavay-2001]

Hi @yiyixuxu, I think I can work on StableDiffusionControlNetPAGImg2ImgPipeline. Pls assign this to me.

[yiyixuxu]

@Bhavay-2001 sure!

[AbhinavJangra29]

@yiyixuxu can i try ?