AST: Introduce the Swift, anyAppleOS, and DriverKit platform kinds
#85167
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This change just stages in a few new platform kinds, without fully adding support for them yet.
Swiftplatform represents availability of the Swift runtime across all platforms that support an ABI stable Swift runtime (see the pitch at https://forums.swift.org/t/pitch-swift-runtime-availability/82742).anyAppleOSplatform is an experimental platform that represents all of Apple's operating systems. This is intended to simplify writing availability for Apple's platforms by taking advantage of the new unified OS versioning system announced at WWDC 2025.DriverKitplatform corresponds to Apple DriverKit which is already supported by LLVM.