Stack components are now entirely logicless.

- GetState is handled in SharedStackSystem
- Adds friend attributes to the stack components

Content.Shared/Stacks/SharedStackSystem.cs

@@ -13,6 +13,7 @@ namespace Content.Shared.Stacks
         {
             base.Initialize();
 
+            SubscribeLocalEvent<SharedStackComponent, ComponentGetState>(OnStackGetState);
             SubscribeLocalEvent<SharedStackComponent, ComponentHandleState>(OnStackHandleState);
             SubscribeLocalEvent<SharedStackComponent, ComponentStartup>(OnStackStarted);
             SubscribeLocalEvent<SharedStackComponent, ExaminedEvent>(OnStackExamined);
@@ -62,6 +63,11 @@ namespace Content.Shared.Stacks
             RaiseLocalEvent(uid, new StackCountChangedEvent(old, component.Count));
         }
 
+        private void OnStackGetState(EntityUid uid, SharedStackComponent component, ref ComponentGetState args)
+        {
+            args.State = new StackComponentState(component.Count, component.MaxCount);
+        }
+
         private void OnStackHandleState(EntityUid uid, SharedStackComponent component, ref ComponentHandleState args)
         {
             if (args.Current is not StackComponentState cast)