[code-watcher] Add CodeWatcherMode option.

There are three option values:
- Disabled: module does nothing (wow).
- Remove: module removes matching messages and sends temporary message
          to instruct user what to do.
- Upload: module uploads detected code to configured Haste Server.

modules/CodeWatcher/Dto/HasteResponse.cs

@@ -0,0 +1,11 @@
+namespace West.TelegramBot.CodeWatcher.Dto;
+
+public class HasteResponse
+{
+    public HasteResponse(string key)
+    {
+        Key = key;
+    }
+
+    public string Key { get; set; }
+}