Support legacy config system

[Amnish04]

This plugin currently only supports the new eslint config system that uses an eslint.config.js file.

Even though the legacy config system with .eslintrc* files is discontinued in eslint 9.0.0, it might still be used in many older projects.

Therefore, it would be good to support the legacy config system as well to make this plugin accessible to such projects.

We could look at how eslint-plugin-react does it for reference.

https://github.com/jsx-eslint/eslint-plugin-react/blob/dd2e9681bca4c20fa184c5bbaca3090ec51d8d7a/index.js#L28-L32

[Amnish04]

Closing this as rule has been integrated into core ESLint and this repo will no longer be maintained!