Add Microsoft.Extensions.DataRetrieval abstractions and pipeline#7508

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luisquintanilla:feature/retrieval-abstractions

Commits on Apr 7, 2026

Add retrieval-side abstractions to MEDI — mirror ingestion pattern

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Commits on Apr 13, 2026

Split retrieval into Microsoft.Extensions.DataRetrieval packages

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Add READMEs for DataRetrieval packages

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