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

Hermes/Socket/Requests/GetDefaultTTSVoiceAck.cs

@@ -0,0 +1,34 @@
+using System.Text.Json;
+using Serilog;
+
+namespace TwitchChatTTS.Hermes.Socket.Requests
+{
+    public class GetDefaultTTSVoiceAck : IRequestAck
+    {
+        public string Name => "get_default_tts_voice";
+        private readonly User _user;
+        private readonly JsonSerializerOptions _options;
+        private readonly ILogger _logger;
+
+        public GetDefaultTTSVoiceAck(User user, JsonSerializerOptions options, ILogger logger)
+        {
+            _user = user;
+            _options = options;
+            _logger = logger;
+        }
+
+        public void Acknowledge(string requestId, string json, IDictionary<string, object>? requestData)
+        {
+            string? defaultVoice = json;
+            if (defaultVoice != null)
+            {
+                _user.DefaultTTSVoice = defaultVoice;
+                _logger.Information($"Default TTS voice was changed [voice: {defaultVoice}]");
+            }
+            else
+            {
+                _logger.Error($"Failed to load default TTS voice.");
+            }
+        }
+    }
+}