Add ostree-counting & ostree-desktop subpackages
    
    Introduce two sub packages to control:
      - counting: if we have enabled Count Me support by default.
      - desktop: if we install the polkit rule to allow privileged users to
        do most rpm-ostree operations via polkit without a password.
    
    We need two distinct sub packages as we currently have the following
    matrix of enablement for those features across our different editions
    and variants:
    
                  Counting      Desktop
    IoT           F34           Never
    CoreOS        Planned       Never
    Silverblue    F34           Always
    Kinoite       F35           F35
    
    This also enables other unofficial / unbranded ostree/rpm-ostree based
    Fedora variants to use those packages to enable those features as they
    see fit.
    
    See discussion in https://pagure.io/Fedora-Council/tickets/issue/361