bug#38161: Guix guided installer should set up printers and scanners

[Danny Milosavljevic]

Hi,

currently, the Guix guided installer does not set up printers and
scanners (see bug# 38064), making those not work after installation.

It would be good to extend the Guix installer to also install "cups" and
"sane-backends" services, just like it already does for networking services,
if applicable.  Long term, we could also do the actual configuration, but
right now even just the services below would already be a big improvement:

The relevant operating-system config snippets are:

  (services
    (append
      (list (service cups-service-type
             (cups-configuration
              (web-interface? #t)
              (extensions
               (list cups-filters escpr hplip-minimal))))
            (simple-service 'custom-udev-rules udev-service-type
                            (list sane-backends))
[...]

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