Stricter access control

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to request a feature or enhancement and not ask a question

### The problem

When controlling group or individual customers, have more restricted control for children or even employees.

### Proposed solution

I propose having an option to create a rule to block all sites and only release those on a list. Thus, creating a group and including all MAC addresses and the option to block everything except the listed urls.

### Alternatives considered and additional information

_No response_