feat: add explicit kwargs to all trainable

[stephantul]

This PR adds explicit kwargs to from_pretrained and from_static_model for all trainable classes. This is done to make them a lot easier to use.

[greptile-apps]

Confidence Score: 4/5

[Medium risk] Refactors model loading to use explicit keyword arguments.

The PR should not merge until inherited loading remains compatible with subclasses that override from_static_model.

_{Reviews (1) · Last reviewed commit: "feat: add explicit kwargs to all trainab..."}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
model2vec/train/base.py	99.56% <100.00%> (+0.01%)	⬆️
model2vec/train/classifier.py	100.00% <100.00%> (+1.57%)	⬆️
model2vec/train/pairs.py	100.00% <100.00%> (ø)
model2vec/train/similarity.py	100.00% <100.00%> (ø)

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