SPIGOT-6829: Add per-player world border API

By: Parker Hawke <hawkeboyz2@hotmail.com>

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -715,6 +715,18 @@ public final class Bukkit {
         return server.getWorld(uid);
     }
 
+    /**
+     * Create a new virtual {@link WorldBorder}.
+     *
+     * @return the created world border instance
+     *
+     * @see Player#setWorldBorder(WorldBorder)
+     */
+    @NotNull
+    public static WorldBorder createWorldBorder() {
+        return server.createWorldBorder();
+    }
+
     /**
      * Gets the map from the given item ID.
      *