chore: update ESLint and add ESLint configuration files

Author: christliebdela

eslint.config.js

@@ -0,0 +1,6 @@
+import { FlatCompat } from "@eslint/eslintrc";
+const compat = new FlatCompat();
+
+export default [
+  ...compat.config({ extends: ["./.eslintrc.json"] })
+];