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.Server/Construction/FlatpackSystem.cs

@@ -4,6 +4,7 @@ using Content.Server.Power.EntitySystems;
 using Content.Shared.Construction;
 using Content.Shared.Construction.Components;
 using Content.Shared.Containers.ItemSlots;
+using Content.Shared.Power;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Timing;