Aws-cdk: [aws-stepfunctions-tasks] Add support for SageMaker Processing

[tuliocasagrande]

SageMaker and Step Functions released a new integration to create processing jobs directly in the state machine:

• https://docs.aws.amazon.com/step-functions/latest/dg/connect-sagemaker.html#sagemaker-example-processing
• https://docs.aws.amazon.com/sagemaker/latest/APIReference/API_CreateProcessingJob.html

Use Case

SageMaker Processing is a very flexible API call that can be used to run preprocessing/post-processing and therefore fully automate a ML use case using Step Functions.

Proposed Solution

Use https://github.com/aws/aws-cdk/blob/master/packages/%40aws-cdk/aws-stepfunctions-tasks/lib/sagemaker/create-training-job.ts as starting point.

Other

• [ ] :wave: I may be able to implement this feature request

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This is a :rocket: Feature Request

[heatsink]

To make sure that effort isn't duplicated:

• I have implemented SageMaker's CreateProcessingJob locally
• I expect to have time to clean up my implementation & submit a pull request for this issue (#9537) by 10-19-2020.