chore: add back in config classes

Mobile Control (for the moment) relies on these classes, so they are necessary in Essentials until we determine a better solution.

src/PepperDash.Essentials.Core/Room/Config/EssentialsHuddleRoomPropertiesConfig.cs

@@ -1,6 +1,6 @@
 using Newtonsoft.Json;
 
-namespace PDT.Plugins.Essentials.Rooms.Config
+namespace PepperDash.Essentials.Room.Config
 {
     /// <summary>
     ///