DoAfter Refactor (#13225)

Co-authored-by: DrSmugleaf <drsmugleaf@gmail.com>

Content.Shared/DoAfter/ActiveDoAfterComponent.cs

@@ -0,0 +1,12 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.DoAfter;
+
+/// <summary>
+///     Added to entities that are currently performing any doafters.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed class ActiveDoAfterComponent : Component
+{
+
+}