Class: Direction RL with Namespaces

`direction RL` runs right to left and a namespace frame still wraps its classes (#2116).

class-direction-rl-with-namespaces.mmd
classDiagram
  direction RL
  namespace Domain {
    class Order
    class Item
  }
  namespace Infra {
    class Repo
  }
  Order "1" --> "*" Item : contains
  Repo ..> Order : stores
Output
Class diagram, Zombie Mermaid Domain Infra Order Item Repo contains 1 * stores

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