tokio-xmpp: set resolve ip_strategy to Ipv4AndIpv6, let connect happy_eyeballs in parallel
The happy_eyeballs implementation should try to connect on both address families. The default of Ipv4thenIpv6 wouldn't query for AAAA if it got A.
The happy_eyeballs implementation should try to connect on both address families. The default of Ipv4thenIpv6 wouldn't query for AAAA if it got A.