how about add 'escape' supporting

[dotnfc]

for some ccid devices, we have to control it using escape channel.
and the PcscPlatform has only transmit method, so, how about add a escape() method?

just like

  Future<List<int>> escape(
    int hCard, List<int> commandBytes,
      {bool newIsolate = false}) {
    throw UnimplementedError('escapeCommand() has not been implemented.');
  }

for flutter_pcsc_windows

  @override
  Future<List<int>> escape(
      int hCard, List<int> commandBytes, { bool newIsolate = false}) {
    return _binding.escapeCommand(hCard, commandBytes, newIsolate: newIsolate);
  }

for pcsc_binds.dart

  Future<Uint8List> escapeCommand(
      int hCard, List<int> sendCommand,
      {bool newIsolate = false}) {
    if (newIsolate) {
      return _escapeCommandInNewIsolate(hCard, sendCommand);
    } else {
      return _escapeCommandInSameIsolate(hCard, sendCommand);
    }
  }

  Future<Uint8List> _escapeCommandInNewIsolate(
      int hCard, List<int> sendCommand) {
    return compute(_computeFunctionEscapeCommand, {
      'h_card': hCard,
      'command': sendCommand
    });
  }

  Future<Uint8List> _escapeCommandInSameIsolate(
      int hCard, List<int> sendCommand) {
    var nativeSendCommand = _allocateNative(sendCommand);

    var pcbRecvLength = calloc<DWORD>();
    pcbRecvLength.value = PcscConstants.MAX_BUFFER_SIZE;
    var pbRecvBuffer = calloc<ffi.Uint8>(pcbRecvLength.value);

    // #define IOCTL_CCID_ESCAPE   SCARD_CTL_CODE(3500)
    int dwControlCode = 0x310000 + 3500*4;

    try {

      var res = _nlwinscard.SCardControl(hCard, dwControlCode, nativeSendCommand.cast(),
          sendCommand.length, pbRecvBuffer.cast(), pcbRecvLength.value, pcbRecvLength);
      _checkAndThrow(res, 'Error while transmitting to ccid device');

      Uint8List response = _asUint8List(pbRecvBuffer, pcbRecvLength.value);

      return Future.value(response);
    } finally {
      calloc.free(nativeSendCommand);
      calloc.free(pcbRecvLength);
      calloc.free(pbRecvBuffer);
    }
  }

and when we connect a device, we should do

pcscCard = await Pcsc.cardConnect(pcscCtx, readerName, PcscShare.direct, PcscProtocol.undefined);

at the same time, a reset() method can be implemented to do a cold/warm reseting a card.