T194049: Introduce SlotRenderingProvider

Phabricator Link	T194049
Status	invalid
Priority	normal (orange)
Author	[1]
Owner	Tgr (Gergő Tisza)
Projects	Multi-Content-Revisions (Done) StructuredDataOnCommons (SDC General) (Backlog) Wikidata (incoming)
Subtasks
Parent Tasks	T194037: Track dependencies for multiple Content objects per page T194042: Replace usages of WikiPage::prepareContentForEdit T194048: Introduce RevisionRenderer (baseline)
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