AST: Begin refactoring AvailabilitySpec to support custom domains #79312
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Hollow out each of the
AvailabilitySpec
subclasses in preparation for adding custom availability domain support toif #available(...)
queries.AvailabilitySpec
should eventually become nothing but a bag of parsed details that must be queried via a request to resolve its availability domain, instead of eagerly resolving the domain during parsing. The next step will be to remove the subclasses entirely.