[Request Evaluator] Begin Formalizing Zones #26892
Merged
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Begin the road to refactoring the interface to defining requests by swapping out SWIFT_TYPEID for SWIFT_REQUEST. For now, SWIFT_REQUEST will still buy you everything that SWIFT_TYPEID does if you're a request. But, importantly, it includes the zone. Zones are now (temporarily) an enum class, and they all retain their original values (though none of this is important). All the places that were defining magic numbers in macros to pass as zones are kaput.
Ideally this patch is NFC.