Added Differential Diffusion to Auraflow.

[satani99]

What does this PR do?

Fixes partially #8924

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

How to test

import torch
from diffusers.utils import load_image
from pipeline_aura_flow_differential_img2img import AuraFlowDifferentialImg2ImgPipeline
pipe = AuraFlowDifferentialImg2ImgPipeline.from_pretrained(
    "fal/AuraFlow", torch_dtype=torch.float32
)
pipe.enable_sequential_cpu_offload()
source_image = load_image(
    "https://huggingface.co/datasets/OzzyGT/testing-resources/resolve/main/differential/20240329211129_4024911930.png"
)
map = load_image(
    "https://huggingface.co/datasets/OzzyGT/testing-resources/resolve/main/differential/gradient_mask_2.png"
)
prompt = "a green pear"
negative_prompt = "blurry"
image = pipe(
    prompt=prompt,
    negative_prompt=negative_prompt,
    image=source_image,
    num_inference_steps=28,
    guidance_scale=4.5,
    strength=1.0,
    map=map,
).images[0]

Who can review?

@a-r-r-o-w @DN6

[yiyixuxu]

cc @asomoza or @a-r-r-o-w for a review!

[a-r-r-o-w]

Thank you for working on this! Just some minor comments, and could you post your results here too?

[github-actions]

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