Combine AdGuardHome to resolve certain hostnames to an AdGuard VPN proxy alias

### 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?

Selective VPN usage for certain hostnames on devices that can't install an AdGuard VPN browser extension or application (Apple TV and alike).

#### Proposed solution

AdGuardHome can resolve to a local alias pointing to AdGuard VPN which proxies the traffic to the VPN server of choice for that hostname. Ideally, paired with a Unix release of AdGuard VPN as 'server' solution (Docker/NAS/router).

#### Alternatives considered

#### Additional information