fix: support named export for CJS (#35)

Author: hardfist

README.md

@@ -37,8 +37,6 @@ Import the plugin in your code:
 // Named import (recommended)
 import { ReactRefreshRspackPlugin } from "@rspack/plugin-react-refresh";
 
-// Default import
-import ReactRefreshRspackPlugin from "@rspack/plugin-react-refresh";
 ```
 
 - CommonJS:

exports/index.cjs

@@ -1,4 +1,7 @@
 // CommonJS wrapper
 const { ReactRefreshRspackPlugin } = require('../dist/index.js');
 
+// default export will be deprecated in next major version
 module.exports = ReactRefreshRspackPlugin;
+
+module.exports.ReactRefreshRspackPlugin = ReactRefreshRspackPlugin;

exports/index.mjs

@@ -1,5 +1,5 @@
 // ES modules wrapper
 import { ReactRefreshRspackPlugin } from '../dist/index.js';
-
+// default export will be deprecated in next major version
 export default ReactRefreshRspackPlugin;
 export { ReactRefreshRspackPlugin };