[Databuckets] Nested Caching (#4917)

* [Databuckets] Nested Caching

* One more

* Update benchmark_databuckets.cpp

* Add caching tests

* Fix tests and scoping

* Update databuckets.cpp

* Fix tests

* Rebase fixes

* [Databuckets] Implement Cache in World (#4920)

world/client.h

@@ -121,6 +121,9 @@ private:
 	bool CanTradeFVNoDropItem();
 	void RecordPossibleHack(const std::string& message);
 	void SendUnsupportedClientPacket(const std::string& message);
+
+	void LoadDataBucketsCache();
+	void ClearDataBucketsCache();
 };
 
 bool CheckCharCreateInfoSoF(CharCreate_Struct *cc);