Parental Control: Toggle all internet except specific sites and include in home assistant integration

On the Parental Control page, it would be great if we had the option to turn off all internet traffic except for specific sites that are already listed in the Allow List page

Then, update the Home Assistant integration to toggle this on and off.

The reason for this request is so when the kids should be doing homework, they can only go to school related websites. The home assistant integration is so it can be easily toggled on or off as needed.