Add the lightEngineMaxBatchSize rule (#654)

* Apply light batch sizes after start region has been created

* Add light batch rules

src/main/java/carpet/mixins/MinecraftServer_coreMixin.java

@@ -52,5 +52,7 @@ public abstract class MinecraftServer_coreMixin
     {
         if (CarpetSettings.spawnChunksSize != 11)
             CarpetSettings.ChangeSpawnChunksValidator.changeSpawnSize(CarpetSettings.spawnChunksSize);
+        
+        CarpetSettings.LightBatchValidator.applyLightBatchSizes();
     }
 }