Enable automatic async/await API generation

The GSI completion handlers use callback as the parameter selector for specifying completion handlers.

callback is not one of the selectors included for automatic async method generation. See https://developer.apple.com/documentation/swift/calling_objective-c_apis_asynchronously

If I manually change the selector in the GIDSignIn.h public header to completion, Xcode will auto-generate the API:

See Calling Objective-C APIs Asynchronously | Apple Developer Documentation for details. Specifically, if the trailing completion block uses the following names, it will automatically be made available to Swift as an async method:

This is based on SE 0297, which discusses a number of Objective-C attributes that can be used to guide the translation process.

Make asynchronous methods callable via async/await

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