wip: working on extern in VM

- Feat: add usage of vm reader instead of old way in vm.c
- Ref: update debug opcodes printing

src/vm/fzl_vm_reader.c

@@ -112,6 +112,8 @@ bool fzl_vm_read(fzl_vm_reader_t *reader)
     return false;
   }
 
+  fclose(fd);
+
   return true;
 }