API to get client side view distance.

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

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -1614,6 +1614,11 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         return new CraftAdvancementProgress(craft, data, progress);
     }
 
+    @Override
+    public int getClientViewDistance() {
+        return (getHandle().clientViewDistance == null) ? Bukkit.getViewDistance() : getHandle().clientViewDistance;
+    }
+
     @Override
     public String getLocale() {
         return getHandle().locale;