Remove unused skyLightSources

There is no point in initialising the sources in Starlight,
as we do not use them. Additionally, they are not saved to
disk so we do not need them.

Maintaining and initialising them is not a negligible cost,
which is why they are being removed.

patches/server/Starlight.patch

@@ -4893,6 +4893,15 @@ diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java b/sr
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
 +++ b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
+@@ -0,0 +0,0 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
+     @Nullable
+     protected BlendingData blendingData;
+     public final Map<Heightmap.Types, Heightmap> heightmaps = Maps.newEnumMap(Heightmap.Types.class);
+-    protected ChunkSkyLightSources skyLightSources;
++    // Paper - starlight - remove skyLightSources
+     private final Map<Structure, StructureStart> structureStarts = Maps.newHashMap();
+     private final Map<Structure, LongSet> structuresRefences = Maps.newHashMap();
+     protected final Map<BlockPos, CompoundTag> pendingBlockEntities = Maps.newHashMap();
 @@ -0,0 +0,0 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
      private static final org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry DATA_TYPE_REGISTRY = new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry();
      public org.bukkit.craftbukkit.persistence.DirtyCraftPersistentDataContainer persistentDataContainer = new org.bukkit.craftbukkit.persistence.DirtyCraftPersistentDataContainer(ChunkAccess.DATA_TYPE_REGISTRY);
@@ -4941,6 +4950,30 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
      public ChunkAccess(ChunkPos pos, UpgradeData upgradeData, LevelHeightAccessor heightLimitView, Registry<Biome> biomeRegistry, long inhabitedTime, @Nullable LevelChunkSection[] sectionArray, @Nullable BlendingData blendingData) {
          this.locX = pos.x; this.locZ = pos.z; // Paper - reduce need for field lookups
+@@ -0,0 +0,0 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
+         this.inhabitedTime = inhabitedTime;
+         this.postProcessing = new ShortList[heightLimitView.getSectionsCount()];
+         this.blendingData = blendingData;
+-        this.skyLightSources = new ChunkSkyLightSources(heightLimitView);
++        // Paper - starlight - remove skyLightSources
+         if (sectionArray != null) {
+             if (this.sections.length == sectionArray.length) {
+                 System.arraycopy(sectionArray, 0, this.sections, 0, this.sections.length);
+@@ -0,0 +0,0 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
+     }
+ 
+     public void initializeLightSources() {
+-        this.skyLightSources.fillFrom(this);
++        // Paper - starlight - remove skyLightSources
+     }
+ 
+     @Override
+     public ChunkSkyLightSources getSkyLightSources() {
+-        return this.skyLightSources;
++        return null; // Paper - starlight - remove skyLightSources
+     }
+ 
+     public static record TicksToSave(SerializableTickContainer<Block> blocks, SerializableTickContainer<Fluid> fluids) {
 diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkStatus.java b/src/main/java/net/minecraft/world/level/chunk/ChunkStatus.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/level/chunk/ChunkStatus.java
@@ -5089,6 +5122,24 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          Iterator iterator = protoChunk.getBlockEntities().values().iterator();
  
          while (iterator.hasNext()) {
+@@ -0,0 +0,0 @@ public class LevelChunk extends ChunkAccess {
+             }
+         }
+ 
+-        this.skyLightSources = protoChunk.skyLightSources;
++        // Paper - starlight - remove skyLightSources
+         this.setLightCorrect(protoChunk.isLightCorrect());
+         this.unsaved = true;
+         this.needsDecoration = true; // CraftBukkit
+@@ -0,0 +0,0 @@ public class LevelChunk extends ChunkAccess {
+                     ProfilerFiller gameprofilerfiller = this.level.getProfiler();
+ 
+                     gameprofilerfiller.push("updateSkyLightSources");
+-                    this.skyLightSources.update(this, j, i, l);
++                    // Paper - starlight - remove skyLightSources
+                     gameprofilerfiller.popPush("queueCheckLight");
+                     this.level.getChunkSource().getLightEngine().checkBlock(blockposition);
+                     gameprofilerfiller.pop();
 diff --git a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java b/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/level/chunk/PalettedContainer.java
@@ -5119,6 +5170,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          this.blockTicks = blockTickScheduler;
          this.fluidTicks = fluidTickScheduler;
      }
+@@ -0,0 +0,0 @@ public class ProtoChunk extends ChunkAccess {
+                     }
+ 
+                     if (LightEngine.hasDifferentLightProperties(this, pos, blockState, state)) {
+-                        this.skyLightSources.update(this, m, j, o);
++                        // Paper - starlight - remove skyLightSources
+                         this.lightEngine.checkBlock(pos);
+                     }
+                 }
 diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java