fix: replace std::cout with std::cerr in the error diagnostics handler (#644)

* Replace `std::cout` with `std::cerr` in the error diagnostics handler

This is half of the solution for #643 and is more than workable in
principle, but still without color. Regarding color, I noticed that
"termcolor" is one of the additional project modules, so I'll see what
that leads to. Finally, I'll review the current tests to see if any
already exist that test the output flow and any coloration. If not, I'll
try to implement such test(s).

* Save benchmark test results

* Delete benchmark test results

Author: Yewzir

include/Ark/Error/Diagnostics.hpp

@@ -64,16 +64,16 @@ namespace Ark::Diagnostics
      */
     std::string makeContextWithNode(const std::string& message, const internal::Node& node);
 
-    ARK_API void generateWithCode(const CodeError& e, const std::string& code, std::ostream& os = std::cout, bool colorize = true);
+    ARK_API void generateWithCode(const CodeError& e, const std::string& code, std::ostream& os = std::cerr, bool colorize = true);
 
     /**
-     * @brief Generate a diagnostic from an error and print it to the standard output
+     * @brief Generate a diagnostic from an error and print it to the standard error output
      *
      * @param e code error
      * @param os output stream
      * @param colorize generate colors or not
      */
-    ARK_API void generate(const CodeError& e, std::ostream& os = std::cout, bool colorize = true);
+    ARK_API void generate(const CodeError& e, std::ostream& os = std::cerr, bool colorize = true);
 }
 
 #endif  // ARK_ERROR_DIAGNOSTICS_HPP