Add Step Functions SageMaker CreateProcessingJob task construct

[athewsey]

Description

As described in aws/aws-cdk#9537, the aws-cdk-lib/aws-stepfunctions-tasks package currently implements task states for some of the optimized SageMaker service integrations such as SageMakerCreateModel and SageMakerCreateTrainingJob, but not for the sagemaker:createProcessingJob task.

In particular, the arn:aws:states:::sagemaker:createProcessingJob.sync task is useful for users because it waits for the processing job to complete - whereas just using an AWS service/SDK sagemaker:createProcessingJob step would require additional states to monitor job status.

There were some previous attempts to get a solution merged in 2020 by @heatsink, but seems like a design was not agreed and to my understanding this RFC process would be the next step to make that happen(?)

Roles

Role	User
Proposed by	@athewsey
Author(s)
API Bar Raiser
Stakeholders

See RFC Process for details

Workflow

• Tracking issue created (label: status/proposed)
• API bar raiser assigned (ping us at #aws-cdk-rfcs if needed)
• Kick off meeting
• RFC pull request submitted (label: status/review)
• Community reach out (via Slack and/or Twitter)
• API signed-off (label api-approved applied to pull request)
• Final comments period (label: status/final-comments-period)
• Approved and merged (label: status/approved)
• Execution plan submitted (label: status/planning)
• Plan approved and merged (label: status/implementing)
• Implementation complete (label: status/done)

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Author is responsible to progress the RFC according to this checklist, and
apply the relevant labels to this issue so that the RFC table in README gets
updated.

[awsmjs]

Closing this ticket. We believe the functionality is beneficial, but does not intersect with the core framework and should be vended and maintained separately.