Cleaned up request acks. Added internal service bus for internal messaging.

Bus/ServiceBusObserver.cs

@@ -0,0 +1,31 @@
+using System.Reactive;
+using Serilog;
+
+namespace TwitchChatTTS.Bus
+{
+    public class ServiceBusObserver : ObserverBase<ServiceBusData>
+    {
+        private readonly Action<ServiceBusData> _action;
+        private readonly ILogger _logger;
+
+        public ServiceBusObserver(Action<ServiceBusData> action, ILogger logger)
+        {
+            _action = action;
+            _logger = logger;
+        }
+
+        protected override void OnCompletedCore()
+        {
+        }
+
+        protected override void OnErrorCore(Exception error)
+        {
+            _logger.Error(error, "Error occurred.");
+        }
+
+        protected override void OnNextCore(ServiceBusData value)
+        {
+            _action.Invoke(value);
+        }
+    }
+}