Add URL input for Prowl (#46427)

Co-authored-by: Joakim Sørensen <hi@ludeeus.dev>

homeassistant/components/prowl/notify.py

@@ -48,6 +48,8 @@ class ProwlNotificationService(BaseNotificationService):
             "description": message,
             "priority": data["priority"] if data and "priority" in data else 0,
         }
+        if data.get("url"):
+            payload["url"] = data["url"]
 
         _LOGGER.debug("Attempting call Prowl service at %s", url)
         session = async_get_clientsession(self._hass)