feat: add utf8 format

- move utf8 stream and format patch from string to patch namespace.
- add ordinay format alias and utf8 format in our format patch.
- add char8_t and char inter-cast in string reinterpret namespace.
- fix bug of utf8 formatter.
- add test for utf8 format.

src/yycc/carton/ironpad.cpp

@@ -82,6 +82,8 @@ namespace yycc::carton::ironpad {
             m_UserCallback = callback;
             // mark registered
             m_IsRegistered = true;
+
+            return true;
         }
         /**
 		 * @brief Try to unregister unhandled exception handler.