NewGroupMetaFactory builds the args for you.

These functions will announce your group or version.

GroupMetaFactory has the logic for actually assembling and registering a group.

GroupMetaFactoryArgs contains the group-level args of a GroupMetaFactory.

GroupVersionFactoryArgs contains all the per-version parts of a GroupMetaFactory.

APIGroupFactoryRegistry allows for groups and versions to announce themselves, which simply makes them available and doesn't take other actions.