This adds a few command sketches but that's not the main point of the PR
and filling those out will come in a different PR. This adds a new flag
type that can combine inputs to a single target slice, retaining the
ability to distinguish where it came from but also keep ordering across
different flag names. It also implements a function that does the
heuristic parsing with fallback.
* Remove Prefix Id and Plugin Name fields. Creating catalogs now require either the plugin id or the name of the plugin resource (but not both). Host Catalogs and Host Sets API resources now have a read only plugin field populated with plugin info. Host Catalogs have a plugin id field as a top level field.
This moves the generated pb files to the `sdk` module. This allows third parties to make use of them if desired (e.g. in upcoming plugins) and moves away from the `gen` nomenclature in the directory, since we are going to be adding some extra interface functions to the messages.
Jeff Mitchell
Todd