[SYSTEMDS-3944] Modality Alignment, Contrastive Learning, new Data Loaders#2461

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Commits on Apr 23, 2026

[SYSTEMDS-3944] Implement new loaders for PDFs and audio to transcript
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[SYSTEMDS-3944] Add modality alignment operator for feature-based matching
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[SYSTEMDS-3944] Add contrastive learning operator for flexible modality pairing
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