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/Power/EntitySystems/ActivatableUIRequiresPowerSystem.cs

@@ -1,4 +1,5 @@
 using Content.Server.Power.Components;
+using Content.Shared.Power;
 using Content.Shared.Power.Components;
 using Content.Shared.Power.EntitySystems;
 using Content.Shared.UserInterface;