feat: adds deviceKey property to LevelControlListItem to synthesize device key

src/PepperDash.Essentials.Core/Devices/LevelControlListItem.cs

@@ -47,6 +47,13 @@ namespace PepperDash.Essentials.Core
             }
         }
 
+        /// <summary>
+        /// The key of the device in the DeviceManager for control
+        /// </summary>
+        [JsonProperty("deviceKey")]
+        public string DeviceKey => DeviceManager.AllDevices.
+            Where(d => d.Key.Contains(ParentDeviceKey) && d.Key.Contains(ItemKey)).FirstOrDefault()?.Key ?? $"{ParentDeviceKey}--{ItemKey}";
+
         /// <summary>
         /// Indicates if the item is a level, mute , or both
         /// </summary>