ChangePhoneNumber constructor
      const
      ChangePhoneNumber({ 
    
- required String phoneNumber,
- PhoneNumberAuthenticationSettings? settings,
Changes the phone number of the user and sends an authentication code to the user's new phone number; for official Android and iOS applications only. On success, returns information about the sent code
Implementation
const ChangePhoneNumber({
  required this.phoneNumber,
  this.settings,
});