iOS13-Sign In with Apple ID

参考：https://xiaozhuanlan.com/topic/8675913204

通过 ASAuthorizationAppleIDButton 使用此功能

审核备注

Sign In with Apple will be available for beta testing this summer. It will be required as an option for users in apps that support third-party sign-in when it is commercially available later this year.

也就是说，当 “Sign In with Apple” 服务正式上线以后，所有已接入其它第三方登录的 App 也必须接入苹果账号登录，否则可能就不给过（当然，那些只有自己账号体系登录的 App 就不用担心了），苹果爸爸还真是强势，所以，适配工作赶快行动起来吧~