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.Server/Sandbox/SandboxSystem.cs

@@ -23,7 +23,7 @@ namespace Content.Server.Sandbox
         [Dependency] private readonly IPlacementManager _placementManager = default!;
         [Dependency] private readonly IConGroupController _conGroupController = default!;
         [Dependency] private readonly IServerConsoleHost _host = default!;
-        [Dependency] private readonly AccessSystem _access = default!;
+        [Dependency] private readonly SharedAccessSystem _access = default!;
         [Dependency] private readonly InventorySystem _inventory = default!;
         [Dependency] private readonly ItemSlotsSystem _slots = default!;
         [Dependency] private readonly GameTicker _ticker = default!;