feat(stepfunctions): add support for Jsonata expressions to Map.ItemSelector

[leonmk-aws]

Issue

Closes #34538.

Reason for this change

In the current implementation itemSelector must be an object type Mapping[str, Any], but Step Functions supports both object mappings and JSONata expressions as strings.

See the Amazon States Language specification:

A JSONata Map State MAY have an "ItemSelector" field, whose value MUST be a JSON text, or a JSONata string that evaluates to a JSON text.

Description of changes

This PR adds a new field jsonataItemSelector of type string to support this use case. This new field is mutually exclusive with itemSelector (and parameters as it is already mutually exclusive with itemSelector and deprecated).

During synthesis, if jsonataItemSelector is used, then it will be used to render the ItemSelector in the cloudformation template.

I considered creating a class like the ProvideItems class, however this would have been a breaking change for existing users.

Describe any new or updated permissions being added

None.

Description of how you validated changes

Added unit tests and an integration test.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

(This review is outdated)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[alvazjor]

I think here we should also validate that the jsonataItemSelector string has the correct syntax format: {% <string> %}

[alvazjor]

LGTM

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: d58729d
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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