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/AirAlarmSystem.cs

@@ -18,6 +18,7 @@ using Content.Shared.DeviceLinking;
 using Content.Shared.DeviceNetwork;
 using Content.Shared.DeviceNetwork.Systems;
 using Content.Shared.Interaction;
+using Content.Shared.Power;
 using Content.Shared.Wires;
 using Robust.Server.GameObjects;
 using Robust.Shared.Player;