Support excluding certain Addresses from the DNS record

[maleck13]

What

A gateway can be given a set of addresses. It is possible that the owner of the gateway does not want all of these addresses to be added to the DNSZone. Example I have an internal IP and an External IP but I only want the external IP to be added to the DNSZone

How

Add some form of allowList to the DNS Policy that can take a set of CIDRs to identify if an address should be used in the DNS response but defaults to all or *

first pass here:
slice of strings, CEL Validated to only be hostnames or IP addresses.
Potentially also allow CIDR ranges, if not too time consuming.