use local library source instead to correct some black-box issue for aliyuniot

lib/ArduinoJson/extras/tests/MsgPackSerializer/measure.cpp

@@ -0,0 +1,14 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2020
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("measureMsgPack()") {
+  DynamicJsonDocument doc(4096);
+  JsonObject object = doc.to<JsonObject>();
+  object["hello"] = "world";
+
+  REQUIRE(measureMsgPack(doc) == 13);
+}