refactor file|path (#1409)

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/util/pathx/readlink+polyfill.go

@@ -0,0 +1,8 @@
+//go:build windows
+// +build windows
+
+package pathx
+
+func ReadLink(name string) (string, error) {
+	return name, nil
+}