T174023: Implement MCR storage layer

Phabricator Link	T174023
Status	resolved
Priority	normal (orange)
Author	[1]
Owner	daniel (Daniel Kinzler)
Projects	Epic Core-Platform-Team-Old (Closed) Multi-Content-Revisions (MCR-SDC Storage Layer - phase 1) (Done) StructuredDataOnCommons (SDC General) (Backlog) Wikidata (monitoring)
Subtasks	T194034: Make rollback inherit all slots from the target version, T194015: Make PageArchive aware of MCR, T198413: Allow multiple slots to be used while still writing to the old as well as the new schema, T174024: Implement MCR revision retrieval interface
Parent Tasks	T174022: Implement multi-content revisions T174044: Deploy MCR storage layer
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