feat(third_party): add oatpp,googltest,benchmark

third_party/oatpp/changelog/1.4.0.md

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+# Oat++ 1.4.0
+
+Previous release - [1.3.0](1.3.0.md)
+
+Feel free to ask questions - [Chat on Gitter!](https://gitter.im/oatpp-framework/Lobby)
+
+Contents:
+
+- [URL Encoder And Decoder](#url-encoder-and-decoder)
+- [Introduce async::ConditionVariable](#async-condition-variable)
+
+
+## URL Encoder And Decoder
+
+```cpp
+#include "oatpp/encoding/Url.hpp"
+
+...
+
+oatpp::String data = "Hello URL-Encoder!!!";
+
+oatpp::encoding::Url::Config config;
+auto encoded = oatpp::encoding::Url::encode(data, config);
+auto decoded = oatpp::encoding::Url::decode(encoded);
+
+OATPP_ASSERT(decoded == data)
+```
+**Note**: Oat++ does NOT automatically decode URL and its parameters on endpoint hit. 
+
+## Async Condition Variable
+
+```cpp
+#include "oatpp/core/async/ConditionVariable.hpp"
+
+  ...
+  
+  oatpp::async::Lock* m_lock;
+  oatpp::async::ConditionVariable* m_cv;
+  
+  ...
+  
+  Action act() override {
+    return m_cv->waitFor(m_lock, // async::Lock
+                         [this]{return m_resource->counter == 100;}, // condition
+                         std::chrono::seconds(5)) // timeout
+           .next(finish());
+  }
+  ...
+```