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/Power/Generator/GasPowerReceiverSystem.cs

@@ -5,6 +5,8 @@ using Content.Server.NodeContainer.EntitySystems;
 using Content.Server.NodeContainer.Nodes;
 using Content.Server.Power.Components;
 using Content.Shared.Atmos;
+using Content.Shared.Power;
+using Content.Shared.Power.Components;
 
 namespace Content.Server.Power.Generator;