Fix Mob Spawning Relative to View Distance

Changes the mob spawning algorithm to properly account for view distance and the range around players.

Needs better documentation.

By: md_5 <git@md-5.net>

paper-server/patches/sources/net/minecraft/server/level/ServerChunkCache.java.patch

@@ -146,7 +146,13 @@
          } else {
              list1 = List.of();
          }
-@@ -425,7 +473,9 @@
+@@ -420,12 +468,14 @@
+             ChunkPos chunkcoordintpair = chunk.getPos();
+ 
+             chunk.incrementInhabitedTime(timeDelta);
+-            if (!list1.isEmpty() && this.level.getWorldBorder().isWithinBounds(chunkcoordintpair)) {
++            if (!list1.isEmpty() && this.level.getWorldBorder().isWithinBounds(chunkcoordintpair) && this.chunkMap.anyPlayerCloseEnoughForSpawning(chunkcoordintpair, true)) { // Spigot
+                 NaturalSpawner.spawnForChunk(this.level, chunk, spawnercreature_d, list1);
              }
  
              if (this.level.shouldTickBlocksAt(chunkcoordintpair.toLong())) {