udevadm: trigger: implement --initialized-match/nomatch arguments

systemd-udev-trigger.service by default triggeres all devices regardless
of whether they were already recognized by systemd-udevd.

There are machines (especially in embedded environments) where
systemd-udev-trigger.service is configured to run at a later stage of
the boot sequence, which can lead to quite a lot of devices being
triggered although they were already recognized by systemd-udevd.

Re-triggering a lot of devices is a relatively expensive operation and
therefore should be avoided if unnecessary.

Therefore this patch introduces --initialized-nomatch, which filters out
devices that are already present in the udev database. For consistance
reasons --initialized-match is implemented as well, which filters out devices
that are *not* already present in the udev database.

Replaces #19949.

shell-completion/bash/udevadm

@@ -51,7 +51,8 @@ _udevadm() {
         [INFO_STANDALONE]='-r --root -a --attribute-walk -x --export -e --export-db -c --cleanup-db
                            -w --wait-for-initialization --value'
         [INFO_ARG]='-q --query -p --path -n --name -P --export-prefix -d --device-id-of-file --property'
-        [TRIGGER_STANDALONE]='-v --verbose -n --dry-run -q --quiet -w --settle --wait-daemon --uuid'
+        [TRIGGER_STANDALONE]='-v --verbose -n --dry-run -q --quiet -w --settle --wait-daemon --uuid
+                              --initialized-match --initialized-nomatch'
         [TRIGGER_ARG]='-t --type -c --action -s --subsystem-match -S --subsystem-nomatch
                        -a --attr-match -A --attr-nomatch -p --property-match
                        -g --tag-match -y --sysname-match --name-match -b --parent-match