Add vae tiling and slicing in img2img and inpaint

[MrSyee]

What does this PR do?

Fixes#6870

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@patrickvonplaten and @sayakpaul

[MrSyee]

I've added vae slicing together. How can I test?

[MrSyee]

Simple test

importtorchfromdiffusersimportAutoPipelineForImage2Imagefromdiffusers.utilsimportload_imagepipe=AutoPipelineForImage2Image.from_pretrained(
"runwayml/stable-diffusion-v1-5",
torch_dtype=torch.float16,
use_safetensors=True,
).to("cuda")
pipe.enable_vae_tiling()
# prepare imageurl="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/img2img-init.png"init_image=load_image(url)
prompt="Astronaut in a jungle, cold color palette, muted colors, detailed, 8k"# pass prompt and image to pipelineimage=pipe(prompt, image=init_image).images[0]
image.save("./result.png")

• Result:
  

[sayakpaul]

LGTM! @yiyixuxu, I think it's okay to not add a test here. WDYT?

[HuggingFaceDocBuilderDev]

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[yiyixuxu]

yes I think we don't need add tests here since it's #copied from and we already have tests for stable diffusion pipeline