feat(wip): room list support

Ragon.Server/Sources/Time/RagonActionTimer.cs

@@ -0,0 +1,21 @@
+using Ragon.Server.Time;
+
+public class RagonActionTimer: IRagonAction
+{
+  private Action _callback;
+  private float _timer;
+  private float _time;
+  
+  public RagonActionTimer(Action callback, float timeInSeconds)
+  {
+    _callback = callback;
+    _time = timeInSeconds * 1000;
+  }
+
+  public void Tick(float dt)
+  {
+    _timer += dt;
+    if (_timer >= _time)
+      _callback?.Invoke();
+  }
+}