Which are the states including the common SFN states for which <state>.output () can be applied ?

This is a separate issue created from the discussion by @nsankar addressed to @wong-a from the issue id #31
The key point is which are the common SFN and AWS specific service states where we can use the form `.output()` in this SDK. Please include it in the documentation.

More details and an example state using output() is as under.,

(1) Which are the states including the common SFN states for which state output () is applicable **or** can be used? This is not in the document unless we see an example, for instance, as an example output () is applicable to the processing step which can be then used in a choice state as cited below:

```
processing_step = ProcessingStep(
"SageMaker processing step",
processor=script_processor,
job_name=execution_input["PreprocessingJobName"], ## placeholder per schema above. Later in workflow execute() below pass the uuid of jobname
inputs=inputs,
outputs=outputs,
# container_arguments=["--train-test-split-ratio", "0.2"],
container_entrypoint=["python3", "/opt/ml/processing/input/code/myprogram.py"],
)

choice_state1.add_choice(ChoiceRule.StringEquals(processing_step**.output()**["ProcessingJobStatus"], "Completed"), lambda_state1)

```

L’issue mentionne ProcessingStep, ChoiceRule.StringEquals et la sortie d’état output(), mais n’identifie ni fichier de documentation ni test. Commencez par localiser la documentation du SDK concernant les états de workflow ainsi que l’exemple de ProcessingStep, puis déterminez quels états courants et spécifiques à AWS prennent en charge output(). La tâche est terminée lorsque la documentation répertorie les états concernés et inclut un exemple fonctionnel.

Rédigé par le modèle d'indexation à partir du texte de l'issue.