Reply clientid to upstream

### 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

There are complex cases of using ADH, for example using nextdns and others as an upstream.
In cases where the main DNS server on the local network is ADH, and the upstream server is, for example, nextdns, then from the point of view of nextdns all requests come from one host (the external IP behind which ADH is located). the protocols used are not important
I would like it to be possible to enable the transfer of ClientID to upstream.

### Proposed solution

Forward ClientID to upstream

### Alternatives considered and additional information

_No response_