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/Light/EntitySystems/UnpoweredFlashlightSystem.cs

@@ -13,6 +13,8 @@ namespace Content.Shared.Light.EntitySystems;
 
 public sealed class UnpoweredFlashlightSystem : EntitySystem
 {
+    // TODO: Split some of this to ItemTogglePointLight
+
     [Dependency] private readonly IPrototypeManager _prototypeManager = default!;
     [Dependency] private readonly IRobustRandom _random = default!;
     [Dependency] private readonly SharedActionsSystem _actionsSystem = default!;