Inheritance of workflow interfaces is not supported

[Spikhalskiy]

  @WorkflowInterface
  public interface CustomerWorkflow {

    @WorkflowMethod
    void execute(Customer customer);

  }

  @WorkflowInterface
  public interface CustomerWorkflowWithSignal extends CustomerWorkflow {

    @SignalMethod(name = "setCustomer")
    void setCustomer(Customer customer);
  }

Registering two classes that implement the interfaces above should be possible, the second implementation should have a CustomerWorkflowWithSignal name.

Instead, it causes "java.lang.IllegalStateException: CustomerWorkflow workflow type is already registered with the worker".

Special consideration should be put into maintaining compatibility during the fix as it may change the workflow names for some users.