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/AtmosAlarmableSystem.cs

@@ -7,6 +7,7 @@ using Content.Server.DeviceNetwork.Systems;
 using Content.Server.Power.Components;
 using Content.Shared.Atmos.Monitor;
 using Content.Shared.DeviceNetwork;
+using Content.Shared.Power;
 using Content.Shared.Tag;
 using Robust.Server.Audio;
 using Robust.Server.GameObjects;