QNAME minimisation support

### 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

### Description

Hello,

please add QNAME minimisation to improve privacy:
https://datatracker.ietf.org/doc/html/rfc7816

Thank you.
Best regards!😮‍💨