fix: direct server clients now have unique client IDs

Using the generated security token as an ID was presenting problems with duplicate connections using the same ID and trying to figure out where to send the messages. Now, the clients have a unique ID that's an increasing integer that restarts at 1 when the program restarts.

src/PepperDash.Essentials.MobileControl/WebSocketServer/JoinToken.cs

@@ -5,6 +5,10 @@ namespace PepperDash.Essentials.WebSocketServer
   /// </summary>
   public class JoinToken
   {
+    /// <summary>
+    /// Unique client ID for a client that is joining
+    /// </summary>
+    public string Id { get; set; }
     /// <summary>
     /// Gets or sets the Code
     /// </summary>