[Clang] Extract availability mapping from VersionMap for watchOS/tvOS
This change makes it possible to extract iOS-to-another-platform version mappings from `VersionMap` in the `SDKSettings.json` file in Darwin SDKs, for example, `iOS_watchOS` and `iOS_tvOS`. This code was originally authored by Alex Lorenz. rdar://81491680 Differential Revision: https://reviews.llvm.org/D116615
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