Parsing and type checking for the definition of isolated conformances #79624
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Allow a conformance to be "isolated", meaning that it stays in the same isolation domain as the conforming type. Only allow this for global-actor-isolated types. When a conformance is isolated, a nonisolated requirement can be witnessed by a declaration with the same global actor isolation as the enclosing type.
When a protocol conformance somehow depends on an isolated conformance, it must itself be isolated to the same global actor as the conformance on which it depends.
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Allow a conformance to be "isolated", meaning that it stays in the same isolation domain as the conforming type. Only allow this for global-actor-isolated types.
When a conformance is isolated, a nonisolated requirement can be witnessed by a declaration with the same global actor isolation as the enclosing type.
Additionally, insure that isolated conformances are viral to other conformances: if a conformance depends on an isolated conformance, it might itself be isolated, and to the same global actor.