`dig` and `named` can now make requests with an EDNS `ZONEVERSION` option present.
Two new `named.conf` options have been added: `request-zoneversion` and
`provide-zoneversion`. `request-zoneversion` is `off` by default. `provide-zoneversion`
is `on` by default.
Closes #4767
Merge branch '4767-implement-zoneversion' into 'main'
See merge request isc-projects/bind9!9103