initialize WASI stdio handles to invalid for better error handling (#4092)

* initialize WASI stdio handles to invalid for better error handling
* implement os_invalid_raw_handle function for consistent invalid handle representation

core/shared/platform/windows/win_file.c

@@ -1810,3 +1810,9 @@ os_realpath(const char *path, char *resolved_path)
 
     return resolved_path;
 }
+
+os_raw_file_handle
+os_invalid_raw_handle(void)
+{
+    return INVALID_HANDLE_VALUE;
+}