[irobot] iRobot binding (#8723)

* [irobot] iRobot binding

Supports iRobot Roomba and probably some other iRobots (in parts where they
are compatible)

* [irobot] Drop custom hivemq wrapper

setUnsubscribeOnStop() has been introduced in
org.openhab.core.io.transport.mqtt.MqttBrokerConnection, so it can now handle
iRobot's quirks. The custom wrapper is no more needed, remove it

Signed-off-by: Pavel Fedin <pavel_fedin@mail.ru>
Co-authored-by: Fabian Wolter <github@fabian-wolter.de>

CODEOWNERS

@@ -104,6 +104,7 @@
 /bundles/org.openhab.binding.intesis/ @hmerk
 /bundles/org.openhab.binding.ipcamera/ @Skinah
 /bundles/org.openhab.binding.ipp/ @peuter
+/bundles/org.openhab.binding.irobot/ @Sonic-Amiga
 /bundles/org.openhab.binding.irtrans/ @kgoderis
 /bundles/org.openhab.binding.ism8/ @hans-reiner
 /bundles/org.openhab.binding.jablotron/ @octa22