feat(Core/Config): Implement config override with env vars (#16817)

* Core/Config: Implement config override with env vars

Implement overriding of configuration from the .conf file with environment variables.
Environment variables keys are autogenerated based on the keys defined in .conf file.

Usage example:

$ export TC_DATA_DIR=/usr
$ AC_WORLD_SERVER_PORT=8080 ./worldserver

* Add tests for env vars config

src/common/Configuration/Config.h

@@ -39,6 +39,9 @@ public:
 
     bool Reload();
 
+    /// Overrides configuration with environment variables and returns overridden keys
+    std::vector<std::string> OverrideWithEnvVariablesIfAny();
+
     std::string const GetFilename();
     std::string const GetConfigPath();
     [[nodiscard]] std::vector<std::string> const& GetArguments() const;