Read Client info from NextDNS CLI

### 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

#### What problem are you trying to solve?

When using AGH as the upstream DoH in the NextDNS CLI The client name isn't parsed. Client info is passed from NextDNS CLI in the header. See here - https://github.com/nextdns/nextdns/blob/master/resolver/doh.go#L97

#### Proposed solution

Allow options in AGH to pull this client info from these header fields.

#### Alternatives considered

There seems to be no other good way to do this and NextDNS CLI is supported on many devices. (I'm using on my UDM Pro as the DoH proxy and setting AGH up to receive/answer all requests)

#### Additional information