Fix and optimize getChunkCount (#11610)

It was returning ticking chunk count instead of the intended full chunk count.
We can also directly use the size of the fullChunks collection instead of iterating all chunks.

patches/server/MC-Utils.patch

@@ -5353,6 +5353,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      private NaturalSpawner.SpawnState lastSpawnState;
 +    // Paper start
 +    private final ca.spottedleaf.concurrentutil.map.ConcurrentLong2ReferenceChainedHashTable<net.minecraft.world.level.chunk.LevelChunk> fullChunks = new ca.spottedleaf.concurrentutil.map.ConcurrentLong2ReferenceChainedHashTable<>();
++    public int getFullChunksCount() {
++        return this.fullChunks.size();
++    }
 +    long chunkFutureAwaitCounter;
 +    // Paper end
  

patches/server/Moonrise-optimisation-patches.patch

@@ -26281,7 +26281,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      private static final Logger LOGGER = LogUtils.getLogger();
      private final DistanceManager distanceManager;
 @@ -0,0 +0,0 @@ public class ServerChunkCache extends ChunkSource {
-     private final ca.spottedleaf.concurrentutil.map.ConcurrentLong2ReferenceChainedHashTable<net.minecraft.world.level.chunk.LevelChunk> fullChunks = new ca.spottedleaf.concurrentutil.map.ConcurrentLong2ReferenceChainedHashTable<>();
+     }
      long chunkFutureAwaitCounter;
      // Paper end
 +    // Paper start - rewrite chunk system

patches/server/Provide-E-TE-Chunk-count-stat-methods.patch

@@ -60,15 +60,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    @Override
 +    public int getChunkCount() {
-+        int ret = 0;
-+
-+        for (ChunkHolder chunkHolder : ca.spottedleaf.moonrise.common.util.ChunkSystem.getVisibleChunkHolders(this.world)) {
-+            if (chunkHolder.getTickingChunk() != null) {
-+                ++ret;
-+            }
-+        }
-+
-+        return ret;
++        return this.world.getChunkSource().getFullChunksCount();
 +    }
 +
 +    @Override