deCONZ - move event handling (#40424)

* Working draft

* Remove event references in sensor

homeassistant/components/deconz/gateway.py

@@ -25,6 +25,7 @@ from .const import (
     NEW_SENSOR,
     SUPPORTED_PLATFORMS,
 )
+from .deconz_event import async_setup_events, async_unload_events
 from .errors import AuthenticationRequired, CannotConnect
 
 
@@ -112,6 +113,8 @@ class DeconzGateway:
                 )
             )
 
+        self.hass.async_create_task(async_setup_events(self))
+
         self.api.start()
 
         self.config_entry.add_update_listener(self.async_config_entry_updated)
@@ -227,9 +230,7 @@ class DeconzGateway:
             unsub_dispatcher()
         self.listeners = []
 
-        for event in self.events:
-            event.async_will_remove_from_hass()
-        self.events.clear()
+        await async_unload_events(self)
 
         self.deconz_ids = {}
         return True