Serve webserver static files by CDN

### Description Add a new config like STATIC_PATH to serve static files from the CDN. Right now, static files are served with gunicorn process, while this works, I find it unnecessary makes the webserver slower. Especially with more users it requires more gunicorn processes to handle. ### Use case/motivation Require more web servers when under the load. ### Related issues _No response_ ### Are you willing to submit a PR? - [X] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)