udev/ata_id: convert to VERB_COMMAND and add --introspect-cli

The custom help() is replaced by a COMMAND() description, and
--introspect-cli is added. The help output had no abstract, so one is
added. There is no man page for this udev helper, so none is referenced.

test/units/TEST-74-AUX-UTILS.introspect-cli.sh

@@ -11,6 +11,7 @@ export SYSTEMD_PAGER=cat
 
 # A smoke test for the introspection code
 INTROSPECTABLE=(
+    ata_id
     bootctl
     busctl
     coredumpctl