ZDI Authority

Add ZDI as a `Metasploit::Model::Authority` as a precondition of merging rapid7/metasploit-framework/master to limhoff-r7/metasploit-framework/module-cache-construction.

Jira Story [MSP-9325](https://jira6.osdc.lax.rapid7.com/browse/MSP-9325)