class InspecPlugins::ResourcePack::Plugin
This simple class handles the plugin definition, so calling it simply Plugin
is OK.
Inspec.plugin returns various Classes, intended to be superclasses for various
plugin components. Here, the one-arg form gives you the Plugin
Definition superclass, which mainly gives you access to the hook / plugin_type DSL.
The number '2' says you are asking for version 2 of the plugin API. If there are
future versions, InSpec promises plugin API v2 will work for at least two more InSpec major versions.