feat(module): implement module initialization status check

* Add STK_MOD_INIT_SUCCESS and STK_MOD_INIT_FAILURE macros to stk.h.
* Update stk_module_load to validate module initialization before finalizing the load.
* Unload library if the init func fails, return error.

include/stk.h

@@ -4,11 +4,16 @@
 #include "stk_version.h"
 #include <stdlib.h>
 
+/* Buffers */
 #define STK_MOD_DIR_BUFFER 256
 #define STK_MOD_ID_BUFFER 64
 #define STK_PATH_MAX 256
 #define STK_PATH_MAX_OS 4096
 
+/* Modules */
+#define STK_MOD_INIT_SUCCESS 0
+#define STK_MOD_INIT_FAILURE 1
+
 #if defined(__linux__) || defined(_WIN32)
 #define STK_EVENT_BUFFER 4096
 #endif