Support eslint flat config

Author: OlivierZal

Diff for: config/flat.js

@@ -0,0 +1,9 @@
+const importPlugin = require('../lib/index');
+
+module.exports = [
+  {
+    plugins: {
+      import: importPlugin,
+    },
+  },
+];

Diff for: src/index.js

@@ -68,4 +68,7 @@ export const configs = {
   'react-native': require('../config/react-native'),
   electron: require('../config/electron'),
   typescript: require('../config/typescript'),
+
+  // flat config support
+  flat: require('../config/flat'),
 };