add requestStream

Author: linux-china

rsocket_client.dart

@@ -6,4 +6,9 @@ void main() async {
       await RSocketConnector.create().connect('tcp://127.0.0.1:42252');
   var result = await rsocket.requestResponse(Payload.fromText('Ping', ''));
   print(result.getDataUtf8());
+ /* rsocket.requestStream(Payload.fromText('Ping', '')).listen((payload) {
+    print(payload.getDataUtf8());
+  }, onDone: () {
+    print('done');
+  });*/
 }