Add Lighting Queue

The lighting queue spreads out the processing of light updates across
multiple ticks based on how much free time the server has left at the end
of the tick.

Spigot-Server-Patches/Optimize-Chunk-Unload-Queue.patch

@@ -144,9 +144,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                    continue;
 +                }
 +                // Paper end
+                 if (chunk.hasLightUpdates()) continue; // Paper - Don't unload chunks with pending light updates.
  
                  ChunkUnloadEvent event = new ChunkUnloadEvent(chunk.bukkitChunk);
-                 server.getPluginManager().callEvent(event);
 @@ -0,0 +0,0 @@ public class ChunkProviderServer implements IChunkProvider {
                                  continue;
                              }