[deconz] Add Pairing/Scene actions, new devices and improve code (#14622)

* port changes
* update instructions
* Incorporate review comments from #14134
* new improvements (mostly Java 17 changes)
* further improvements

Signed-off-by: Jan N. Klug <github@klug.nrw>

CODEOWNERS

@@ -64,7 +64,7 @@
 /bundles/org.openhab.binding.dali/ @rs22
 /bundles/org.openhab.binding.danfossairunit/ @pravussum
 /bundles/org.openhab.binding.dbquery/ @lujop
-/bundles/org.openhab.binding.deconz/ @openhab/add-ons-maintainers
+/bundles/org.openhab.binding.deconz/ @J-N-K
 /bundles/org.openhab.binding.denonmarantz/ @jwveldhuis
 /bundles/org.openhab.binding.deutschebahn/ @soenkekueper
 /bundles/org.openhab.binding.digiplex/ @rmichalak