✨ feat(exdata & mq header): define default free_cb

include/stellar/stellar_exdata.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "utils.h"
 #include "stellar.h"
 
 #ifdef __cplusplus
@@ -8,6 +9,13 @@ extern "C"
 #endif
 
 typedef void stellar_exdata_free(int idx, void *ex_ptr, void *arg);
+
+
+inline static void stellar_exdata_free_default(int idx __unused, void *ex_ptr, void *arg __unused)
+{
+	if(ex_ptr)FREE(ex_ptr);
+}
+
 int stellar_exdata_new_index(struct stellar *st, const char *name, stellar_exdata_free *free_func,void *arg); 
 
 //packet exdata api