Integrate AdGuardVPN/TrustTunnel

### 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

I see more & more routers supporting AdGuardHome, & also https://adguard-vpn.com/en/router/overview.html showing how to setup AGVPN on routers, but not any that seem to do both together.

### Proposed solution

Maybe AdGuardHome could integrate support directly for AdGuardVPN, now that TrustTunnel is released?

### Alternatives considered and additional information

There seems to be ways to do this indirectly via single-board computer setups, but that's really involved.