stack: DNS server

[hazzuk]

Prerequisites

• I have searched existing and closed feature requests

Proposal

Add a stack to provide a custom DNS server for use on a local network.

Motivation

• DNS over HTTPS
• Optional ad blocking
• Custom DNS values for your local network
• Overall improved privacy & security

Context

Software to evaluate:

• Pi-hole
• AdGuard Home
• Technitium
• blocky
• Gravity
• GoAway
• dns (by the creator of Gluetun)