Add MLCD model

[tanhuajie]

What does this PR do?

This PR adds MLCD model from DeepGlint-AI Team.

Fixes #36181

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
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• Did you write any new necessary tests?

Who can review?

@amyeroberts @qubvel @ArthurZucker

Quick Test

from transformers import AutoProcessor, MLCDVisionModel
from PIL import Image
import requests

# Load model and processor
model = MLCDVisionModel.from_pretrained("DeepGlint-AI/mlcd-vit-bigG-patch14-336")
processor = AutoProcessor.from_pretrained("DeepGlint-AI/mlcd-vit-bigG-patch14-336")

# Process single image
url = "http://images.cocodataset.org/val2017/000000039769.jpg"
image = Image.open(requests.get(url, stream=True).raw)
inputs = processor(images=image, return_tensors="pt")

# Get visual features
outputs = model(**inputs)
features = outputs.last_hidden_state

print(f"Extracted features shape: {features.shape}")

[tanhuajie]

Hi, Pavel @qubvel. Hope this message finds you well. It appears that our PR failed on the final step during CI. From the error messages, it looks like the issue stems from the Rt-Detr tests rather than problems within our code. Could you please guide us on how to disable or skip the tests for other models so we can successfully complete the CI process for our PR? Thanks!

[anxiangsir]

Hi Pavel and Arthur, @qubvel @Rocketknight1 :

Could you please take a moment to review the pull request? Your insights would be immensely appreciated and would greatly contribute to ensuring the quality of the changes. We're truly grateful for your help!

Thank you so much!