Power stuff (#31314)

* Power stuff

- Add shared IsPowered
- Add shared ResolveApc
- Move PowerChangedEvent to shared for now
- Add SlimPoweredLight that actually functions how you'd expect a PoweredLight to function it id didn't have a bunch of bloat on it.

* big update

* boing

Content.Shared/Power/EntitySystems/SharedPowerReceiverSystem.cs

@@ -1,3 +1,4 @@
+using System.Diagnostics.CodeAnalysis;
 using Content.Shared.Examine;
 using Content.Shared.Power.Components;
 
@@ -5,6 +6,16 @@ namespace Content.Shared.Power.EntitySystems;
 
 public abstract class SharedPowerReceiverSystem : EntitySystem
 {
+    public abstract bool ResolveApc(EntityUid entity, [NotNullWhen(true)] ref SharedApcPowerReceiverComponent? component);
+
+    public bool IsPowered(Entity<SharedApcPowerReceiverComponent?> entity)
+    {
+        if (!ResolveApc(entity.Owner, ref entity.Comp))
+            return true;
+
+        return entity.Comp.Powered;
+    }
+
     protected string GetExamineText(bool powered)
     {
         return Loc.GetString("power-receiver-component-on-examine-main",