Huntress: add sort rules for agents by OS type

The Huntress integration currently syncs all agents into the single asset layout I choose. There is no sort rule to place agents into different asset layouts based on an attribute, as other integrations allow. As a result, servers, workstations, and Macs all land in one layout, creating duplicates of devices already documented in other layouts.

I would like sort rules for Huntress agents so each agent is placed in the correct asset layout based on reliable data exposed by the Huntress API.