Allow to config alternative DoH/DoT/Normal DNS and easy switch to other

Example if I using NextDNS with all blocked tracking. It will make Agoda app not working.

sometime, I need to change DNS profile to Google DNS/Cloudflare to make other app working

When I enable NextDNS again. It will required to change DNS profile back to NextDNS then turn on

If we can do it in NextDNS app. It will better