Add an option to make logging per client opt-in instead of opt-out

### 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

Right now I can disable logging for specific clients or disable it for everybody. When a friend or guest is using my network I can see exactly what they were doing and there is no way to prevent this right from the start. I don't want that. It doesn't sit right with me privacy-wise. I don't want to have to tell each one of my visitors that their internet traffic is being logged by me but I feel that doing that without their consent is not right either.

I still want my own clients to be logged in case I need to do some trouble-shooting though.

Right now the only option is to identify each client, log in to the GUI and disable logging specifically for this client. This is quite involved and I can't do that before the client connects for the first time.

### Proposed solution

Add an option to enable logging only for select clients and disable it for everybody else.

### Alternatives considered and additional information

Anonymizing the IP doesn't help much since it's a very small network and it's still pretty clear and obvious which requests weren't mine.