[Sana Sprint] add image-to-image pipeline

[linoytsaban]

This PR adds sana sprint image-to-image ⚡️⚡️
@sayakpaul @apolinario

import torch
from diffusers import SanaSprintImg2ImgPipeline
from diffusers.utils.loading_utils import load_image

image = load_image(
    "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/penguin.png"
)

pipe = SanaSprintImg2ImgPipeline.from_pretrained("Efficient-Large-Model/Sana_Sprint_1.6B_1024px_diffusers", torch_dtype=torch.bfloat16)
pipe.to("cuda")

pipe(prompt="a cute pink bear", 
        image=image, 
        strength=0.45, 
        height=832, width=480).images[0]

run time on H100 -

100%
 1/1 [00:00<00:00, 14.24it/s]

[linoytsaban]

@bot /style

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[sayakpaul]

@linoytsaban could you also update the PR with example code and results? And maybe also comment a bit on the speed repercussions?

[sayakpaul]

Thanks! Left some comments. Also, I think we need to add to docs.

[linoytsaban]

@bot /style

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[linoytsaban]

@bot /style

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