Add stats for kaigen

src/Managing.Domain/Bots/IBot.cs

@@ -8,6 +8,11 @@
         void Restart();
         string GetStatus();
         string GetName();
+        /// <summary>
+        /// Gets the total runtime of the bot since it was started
+        /// </summary>
+        /// <returns>TimeSpan representing the runtime, or TimeSpan.Zero if the bot is not running</returns>
+        TimeSpan GetRuntime();
         void SaveBackup();
         void LoadBackup(BotBackup backup);
     }