ENH: Adds BioViL-T Linear Classifier (Chexpert Classes)

[ozan-oktay]

• Adds the capability to instantiate a linear classifier on top frozen BioViL-T image embeddings.
• Note that the model is not trained in an end-to-end fashion.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.39%. Comparing base (190e8d4) to head (f9e99fa).
⚠️ Report is 57 commits behind head on main.

Additional details and impacted files

Flag	Coverage Δ
hi-ml-multimodal	∅ <100.00%> (∅)

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Files with missing lines	Coverage Δ
...al/src/health_multimodal/image/model/pretrained.py	85.00% <100.00%> (+2.14%)	⬆️

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[fepegar]

Shall we review now or wait until it's not a draft anymore?

[fepegar]

Can you please take a look at the failing tests and the merge conflicts?