GIDTokenClaim Implementation + Unit Tests #832

Job	Run time
spm-build-test (macos-15, iphonesimulator)	4m 22s
spm-build-test (macos-15, macosx)	2m 5s
pod-lib-lint (macos-13, GoogleSignIn.podspec)	9m 21s
pod-lib-lint (macos-13, GoogleSignIn.podspec, --use-static-frameworks)	13m 12s
pod-lib-lint (macos-13, GoogleSignInSwiftSupport.podspec)	11m 48s
pod-lib-lint (macos-13, GoogleSignInSwiftSupport.podspec, --use-static-frameworks)	15m 45s
	56m 33s

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