Add a debug overlay for accessreaders (#9681)

> didnt pjb have issues with doing the control stuff in an overlay and just wanted direct texture draw

I ended up doing dis.

Content.Client/Access/AccessSystem.cs

@@ -0,0 +1,5 @@
+using Content.Shared.Access.Systems;
+
+namespace Content.Client.Access;
+
+public sealed class AccessSystem : SharedAccessSystem {}