Feat: add sub workflows run on `FuncDSL`

**What would you like to be added**:

We are missing the `workflow` run from the main `FuncDSL` class. It lives only on `DSL`:

```java
  public static TasksConfigurer workflow(WorkflowConfigurer configurer) {
    return list -> list.workflow(configurer);
  }
```
           
**Why is this needed**:

Enhance compatibility between the two approaches.