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/Light/EntitySystems/EmergencyLightSystem.cs

@@ -7,6 +7,7 @@ using Content.Server.Station.Systems;
 using Content.Shared.Examine;
 using Content.Shared.Light;
 using Content.Shared.Light.Components;
+using Content.Shared.Power;
 using Content.Shared.Station.Components;
 using Robust.Server.GameObjects;
 using Color = Robust.Shared.Maths.Color;