Implement reference count tracing for dns_catz_zone_t and dns_catz_zones_t
Following similar changes in the RPZ module, this merge request performs some renaming and simple refactoring changes in the CATZ module, and introduces reference count tracing, which can be activated by defining DNS_CATZ_TRACE
in catz.h
header file.
The CATZ module shares many similarities to the RPZ module in its general structure, so it is beneficial to keep them in sync where it makes sense to do so.