#773: Add method to get max world size

By: pop4959 <pop4959@gmail.com>

paper-server/src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -615,6 +615,11 @@ public final class CraftServer implements Server {
         return this.getProperties().generatorSettings.shouldGenerateMapFeatures();
     }
 
+    @Override
+    public int getMaxWorldSize() {
+        return this.getProperties().maxWorldSize;
+    }
+
     @Override
     public boolean getAllowEnd() {
         return this.configuration.getBoolean("settings.allow-end");