reject method
Implementation
@override
Future<ActionCallback> reject() async {
V2TimCallback res = await timManager
.getSignalingManager()
.reject(inviteID: mCurCallID, data: jsonEncode(getCustomMap()));
_stopCall();
emitEvent(TRTCCallingDelegate.onReject, mCurCallID);
return ActionCallback(code: res.code, desc: res.desc);
}