Add ble to AuthenticatorTransport enum

[liuzs0666]

BLE is the standard enum value. Keeping bluetooth just for backward compatibility.

[Dopeamin]

I think it would make more sense to have one enum :

It should still be backwards compatible as the entry point for users would be the factory function and the switch logic .

@JsonValue('bluetooth')
  Bluetooth;

factory AuthenticatorTransport.fromPlatformType(String value) {
switch (value) {
return AuthenticatorTransport.Nfc;
case 'bluetooth':
return AuthenticatorTransport.Bluetooth;
      case 'ble':
        return AuthenticatorTransport.Bluetooth;