Support 0-RTT in DNS over QUIC

[msoxzw]

Quote from RFC 9250

Using 0-RTT for DoQ has many compelling advantages. Clients can
establish connections and send queries without incurring a connection
delay. Servers can thus negotiate low values of the connection
timers, which reduces the total number of connections that they need
to manage. They can do that because the clients that use 0-RTT will
not incur latency penalties if new connections are required for a
query.

In addition, DoQ server may send Retry Packets to use the Address Validation, and send NEW_TOKEN frames to clients after the client address is validated in order to avoid the 1-RTT penalty during subsequent connections by the client from the same address. However, unfortunately, quinn, the QUIC implementation in trust-dns, has not yet supported the NEW_TOKEN mechanism.

[bluejekyll]

Thanks for this PR, looks good.