T209924: Specify PageTypeHandler

Phabricator Link	T209924
Status	open
Priority	needs triage (violet)
Author	[1]
Owner
Projects	Multi-Content-Revisions (New Features) CPT Initiatives (MCR)
Subtasks	T194046: Introduce SlotRoleHandler and SlotRoleRegistry for declaring slot roles., T211726: Collect requirements for slot based layout
Parent Tasks	T209878: Allow control of page layout of multiple slots during rendering
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