Dynamic A records similar to nip.io or xip

[Jan-Piet Mens]

>DLZ are loadable modules

I should have pointed to the documentation [1] and some example modules [2].

	-JP

[1] https://github.com/isc-projects/bind9/tree/main/contrib/dlz/example
[2] https://github.com/isc-projects/bind9/tree/main/contrib/dlz/modules