Encrypted DNS support

[Mikaela]

I happened to notice that whenever I am connected to Yggdrasil, Android settings start reporting that I am disconnected from private DNS.

I consider this as a security issue and wish to be able to configure either DNS over HTTPS (preferred) or DNS over TLS to avoid leaking my queries outside of Yggdrasil in plain text.

I know the query would be encrypted within Yggdrasil, but I don't want to use a Yggdrasil based DNS server, because many things tend to judge user location based on DNS server location, which would break in this case, leading to suboptimal routingm