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/EssentialsRoomCombinerPropertiesConfig.cs

@@ -103,6 +103,12 @@ namespace PepperDash.Essentials.Core
         [JsonProperty("name")]
         public string Name { get; set; }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether to hide this scenario in the UI.
+        /// </summary>
+        [JsonProperty("hideInUi", NullValueHandling = NullValueHandling.Ignore)]
+        public bool HideInUi { get; set; }
+
         /// <summary>
         /// Gets or sets the collection of partition states.
         /// </summary>