QNAME case randomization support for UDP transport protocol

### 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

The small (16-bit) size of the DNS transaction ID has made it a
frequent target for forgery, with the unhappy result of many cache
pollution vulnerabilities demonstrated throughout Internet history.
Even with perfectly and unpredictably random transaction ID's, random
and birthday attacks are still theoretically feasible. This document
describes a method by which an initiator can improve transaction
identity using the 0x20 bit in DNS labels.

### Proposed solution

Proposed solution:
https://datatracker.ietf.org/doc/html/draft-vixie-dnsext-dns0x20-00

### Alternatives considered and additional information

_No response_