T209878: Allow control of page layout of multiple slots during rendering

Phabricator Link	T209878
Status	open
Priority	normal (orange)
Author	[1]
Owner
Projects	Multi-Content-Revisions (New Features) Epic CPT Initiatives (MCR)
Subtasks	T200915: Allow SlotRoleHandlers to control page layout, T205459: Decide how SlotRoleHandlers can provide placeholders for missing slots, T209924: Specify PageTypeHandler, T211726: Collect requirements for slot based layout
Parent Tasks	T174022: Implement multi-content revisions
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