T174030: Implement DB schema migration tools for MCR

Phabricator Link	T174030
Status	resolved
Priority	normal (orange)
Author	[1]
Owner	Anomie (Brad Jorsch)
Projects	Epic Multi-Content-Revisions (MCR-SDC Storage Layer - phase 1) (Done) StructuredDataOnCommons (SDC General) (Continuous tasks / Epics) Wikidata (monitoring)
Subtasks	T182678: &#91 MCR&#93 Script for populating empty ar_rev_id fields, T174028: Finalize database schema for MCR content meta-data, T182682: &#91 MCR&#93 Script(s) for populating new tables (slots, content, content_models, slot_roles)
Parent Tasks	T174038: Initial implementation of MCR page update interface T174045: DB schema migration for MCR T183488: MCR schema migration stage 2: populate new fields
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