Support IP Adapter weight loading in StableDiffusionXLControlNetInpaintPipeline

[nkaewam]

What does this PR do?

Fixes#6866 and also an extension of PR: #6941

Added IPAdapterMixin loader to StableDiffusionXLControlNetInpaintPipeline to allow for .load_ip_adapter in pipeline.

Example snippet code:

image_encoder=CLIPVisionModelWithProjection.from_pretrained(
"h94/IP-Adapter",
subfolder="models/image_encoder",
torch_dtype=torch.float16,
cache_dir=CACHE_DIR
).to(device)
pipe=StableDiffusionXLControlNetInpaintPipeline.from_pretrained(
weight_path,
cache_dir=CACHE_DIR,
vae=sd_vae,
controlnet=controlnet, image_encoder=image_encoder,
torch_dtype=torch.float16
).to(device)
# this PR allows this to be possible pipe.load_ip_adapter("h94/IP-Adapter", subfolder="sdxl_models", weight_name="ip-adapter-plus_sdxl_vit-h.safetensors", cache_dir=CACHE_DIR)
images=pipe(
image=room_image,
ip_adapter_image=style_image, control_image=control_image, mask_image=mask_image,
...other-params
).images

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[yiyixuxu]

oh thanks for the PR!

can you make sure the tests pass? run make style

[nkaewam]

@yiyixuxu Woops sorry, fixed

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