use std/esm to make chef compatible with cjs projects. Remove webpack work for node

src/node/cjs.js

@@ -0,0 +1,13 @@
+/**
+ * Export the main ESM module as CommonJS
+ *
+ *
+ * @author d98762656 [d98762625@gmail.com]
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+/*eslint no-global-assign: ["off"] */
+require = require("esm")(module);
+module.exports = require("./index.mjs");
+module.exports.File = require("./File.mjs");