Feature Request: Support for Local WireGuard Deployments

[K-J-VV]

Would be great to be able to proxy containers through Gluetun to local deployments of WireGuard.

Example:

Let's say I have 2x servers, one at my home and one at my parents. The server at parents has its own working WireGuard instance. I'd like to be able to have Gluetun + container at my home tunneled over to my parents. In this example, the container on my home server would now be able to access my parents local network through wireguard.