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/Kitchen/EntitySystems/ReagentGrinderSystem.cs

@@ -21,6 +21,7 @@ using Robust.Shared.Timing;
 using System.Linq;
 using Content.Server.Jittering;
 using Content.Shared.Jittering;
+using Content.Shared.Power;
 
 namespace Content.Server.Kitchen.EntitySystems
 {