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/Atmos/Monitor/Systems/AtmosMonitoringSystem.cs

@@ -9,6 +9,7 @@ using Content.Server.Power.EntitySystems;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Monitor;
 using Content.Shared.DeviceNetwork;
+using Content.Shared.Power;
 using Content.Shared.Tag;
 using Robust.Shared.Prototypes;