ItemToggle + slots stuff (#31312)

* ItemToggle + slots stuff

- Add component for itemslot locks to match LockComponent (surprised this didn't exist).
- Add thing for pointlight to match itemtoggle. In future should be used for PDAs and stuff but need to fix some other stuff first.

* Also this

* grill

Content.Shared/Power/EntitySystems/ItemSlotRequiresPowerSystem.cs

@@ -0,0 +1,23 @@
+using Content.Shared.Containers.ItemSlots;
+using Content.Shared.Power.Components;
+
+namespace Content.Shared.Power.EntitySystems;
+
+public sealed class ItemSlotRequiresPowerSystem : EntitySystem
+{
+    [Dependency] private readonly SharedPowerReceiverSystem _receiver = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<ItemSlotRequiresPowerComponent, ItemSlotInsertAttemptEvent>(OnInsertAttempt);
+    }
+
+    private void OnInsertAttempt(Entity<ItemSlotRequiresPowerComponent> ent, ref ItemSlotInsertAttemptEvent args)
+    {
+        if (!_receiver.IsPowered(ent.Owner))
+        {
+            args.Cancelled = true;
+        }
+    }
+}