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.Shared/Power/PowerChangedEvent.cs

@@ -0,0 +1,8 @@
+namespace Content.Shared.Power;
+
+/// <summary>
+/// Raised whenever an ApcPowerReceiver becomes powered / unpowered.
+/// Does nothing on the client.
+/// </summary>
+[ByRefEvent]
+public readonly record struct PowerChangedEvent(bool Powered, float ReceivingPower);