Add skipping world symlink scan

In worlds that are extremely large (greater than 1TB), it can take an insanely long time to walk the entire world for symlinks.
This patch adds a system property to disable the symlink scan, which can be used to speed up world loading.

paper-server/patches/sources/net/minecraft/world/level/storage/LevelStorageSource.java.patch

@@ -31,9 +31,10 @@
  
 -    public LevelStorageSource.LevelStorageAccess validateAndCreateAccess(String directoryName) throws IOException, ContentValidationException {
 -        Path path = this.getLevelPath(directoryName);
+-        List<ForbiddenSymlinkInfo> list = this.worldDirValidator.validateDirectory(path, true);
 +    public LevelStorageSource.LevelStorageAccess validateAndCreateAccess(String s, ResourceKey<LevelStem> dimensionType) throws IOException, ContentValidationException { // CraftBukkit
 +        Path path = this.getLevelPath(s);
-         List<ForbiddenSymlinkInfo> list = this.worldDirValidator.validateDirectory(path, true);
++        List<ForbiddenSymlinkInfo> list = Boolean.getBoolean("paper.disableWorldSymlinkValidation") ? List.of() : this.worldDirValidator.validateDirectory(path, true); // Paper - add skipping of symlinks scan
  
          if (!list.isEmpty()) {
              throw new ContentValidationException(path, list);