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/AlertLevel/AlertLevelDisplaySystem.cs

@@ -1,6 +1,7 @@
 using Content.Server.Power.Components;
 using Content.Server.Station.Systems;
 using Content.Shared.AlertLevel;
+using Content.Shared.Power;
 
 namespace Content.Server.AlertLevel;