[google_sign_in] PR 4/4 Convert the Pigeon host API from Objective-C to Swift - #12658

[google_sign_in] PR 4/4 Convert the Pigeon host API from Objective-C to Swift#12658

victogomez-cs wants to merge 4 commits into

pr3/google-sign-in-ios-view-providerflutter/packages:pr3/google-sign-in-ios-view-providerfrom

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