Add DoQ / RHINE over SCION service

[amdfxlucas]

package the caddy DNS-over-QUIC implementation (server+resolver+client) into a SEED service

[martenwallewein]

I would really like to see DoQ over scion in seed! About Rhine I'm not sure. With caddy implementation do you refer to the core dns plugin that you and Thorben wrote for this?

[amdfxlucas]

I would really like to see DoQ over scion in seed! About Rhine I'm not sure. With caddy implementation do you refer to the core dns plugin that you and Thorben wrote for this?

Yep and the sdns recursive resolver to query the server

[amdfxlucas]

Implementation branch is scion-doq.

TODO:

• setup Google Trillian CA/monitor/logger according to Torben's instructions and the official docs

README

Maybe even adapt tessera the successor to trilian.