Implement GIDVerifyAccountDetail interface methods to start interactive flow by creating an instance of GIDSignInInternalOptions and calling a method to start the authorization flow passing in those options. Additionally, methods to generate a new configuration was moved from GIDSignIn to GIDConfiguration.

1. Add new method, -[GIDVerifyAccountDetail verifyAccountDetailsInteractivelyWithOptions:], that will start the authorization flow.
2. Implement GIDVerifyAccountDetail interface methods to generate a configuration from bundle.
3. Create a GIDSignInInternalOptions instance and call -[GIDVerifyAccountDetail verifyAccountDetailsInteractivelyWithOptions:].