reject method

Implementation

Future<NEResult> reject() async {
  final result = await NECallEngine.instance.hangup("");
  CallKitUILog.i(_tag, "reject result = $result");
  CallState.instance.selfUser.callStatus = NECallStatus.none;
  NECallKitPlatform.instance.updateCallStateToNative();
  return NEResult(code: result.code, message: result.msg);
}