feat: Add HideInUi property to room combiner classes

- Introduced `HideInUi` property in `EssentialsRoomCombinerPropertiesConfig` to control UI visibility.
- Added `HideInUi` interface property in `IEssentialsRoomCombiner`.
- Implemented `HideInUi` in `RoomCombinationScenario`, along with new `Key` and `Name` properties for improved data representation.

src/PepperDash.Essentials.Core/Room/Combining/IEssentialsRoomCombiner.cs

@@ -109,6 +109,12 @@ namespace PepperDash.Essentials.Core
         [JsonProperty("isActive")]
         bool IsActive { get; }
 
+        /// <summary>
+        /// Gets a value indicating whether the entity is active.
+        /// </summary>
+        [JsonProperty("hideInUi")]
+        bool HideInUi { get; }
+
         /// <summary>
         /// Activates this room combination scenario
         /// </summary>