new: usr: Add "Zone has [AAAA/A] records but is not served by IPv[6/4]" warnings

Check that zones with AAAA records are served by IPv6 servers and that zones with A records are served by IPv4 servers.
Sometimes, IPv6 services are accidentally misconfigured and zones with IPv6 (AAAA) address records are not served by DNS servers with IPv6 addresses, which means they need to use translation devices to look up those IPv6 addresses. The reverse is also sometimes true: zones with A records are not resolvable over IPv4 when they should be.
To prevent this, BIND now looks for these misconfigured zones and issues a warning if they are found.

Closes #4370

Merge branch '4370-check-that-a-zone-is-served-by-ipv6-servers-if-it-has-aaaa-records' into 'main'

See merge request isc-projects/bind9!8393