cli: allow looking up for first available modem or SIM

When a system only has one single modem, it's convenient to just look
for the first available modem or SIM object, instead of needing to
provide the full path or the exact index number.

This improvement allows users to use the "any" keyword, or any of its
substrings (e.g. "an" or even "a") to match the first available object
of the requested type.

E.g.:

  $ mmcli -m a
    --------------------------------
    General  |            dbus path: /org/freedesktop/ModemManager1/Modem/0
             |            device id: 1a48f1180f1fb0166d91f7b139d027136b59ba63
    --------------------------------
    Hardware |         manufacturer: Sierra Wireless Inc.
             |                model: Sierra Wireless EM7345 4G LTE
    ...

Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/196

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