[OpenVINO] Support allenai/MolmoWeb-4B (Molmo2)

[openvino-agent]

What does this PR do?

Installation instructions:

pip install optimum-intel@
pip install transformers==4.57.3

Cmd-line for export:

optimum-cli export openvino -m allenai/MolmoWeb-4B MolmoWeb-4B --trust-remote-code

The script for inference:

from transformers import AutoProcessor
from optimum.intel.openvino import OVModelForVisualCausalLM

model_id = "./MolmoWeb-4B"
#model_id = "allenai/MolmoWeb-4B"
model = OVModelForVisualCausalLM.from_pretrained(model_id, trust_remote_code=True)

processor = AutoProcessor.from_pretrained(model_id, padding_side="left", trust_remote_code=True)

url = "https://media.istockphoto.com/id/1192867753/photo/cow-in-berchida-beach-siniscola.jpg?s=612x612&w=0&k=20&c=v0hjjniwsMNfJSuKWZuIn8pssmD5h5bSN1peBd1CmH4="
messages = [
    {
        "role": "user", "content": [
            {"type": "image", "url": url},
            {"type": "text", "text": "What is shown in this image?"},
        ]
    },
]
inputs = processor.apply_chat_template(
    messages,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
    add_generation_prompt=True,
)

output = model.generate(**inputs, max_new_tokens=50)
print(processor.decode(output[0, inputs.input_ids.shape[1]:], skip_special_tokens=True))

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?