Update ProcessingInput / ProcessingOutput

[owen-t]

Describe the feature you'd like

• Bring ProcessingInput and ProcessingOutput up to date with API model. Specifically add support for FeatureGroup to ProcessingOutput.

How would this feature be used? Please describe.

• Take advantage of new service features.

[aarsanjani]

Per above, We are trying to integrate Pipelines into and to leverage Feature Store:

Describe the feature you'd like
the integration point between the pipeline processing step and the input into the Fstore is ambiguous: we don't know what parameter in sagemaker. worklfow.steps.ProcessingStep we would use to write the output to the FeatureStore.

[aarsanjani]

Also allow the Next pipelines ProcessingStep to Ingest features as input from the FeatureStore

[icywang86rui]

The PR is under review #2031

[martinRenou]

Closed as fixed by d #2031