Updated the `defaults/main.yml`, `handlers/main.yml`, and `tasks/main.yml` files to add NTP server configuration and a backup of the original `ntp.conf` file. This ensures that the system uses AD DCs as time sources and maintains a backup for future reference.
Updated the role to include optional tests after running it, ensuring that DNS resolution is correctly configured. The code has been refactored to improve readability and maintainability.
