feat(stepfunctions): support Map ItemSelector

[abdelnn]

Adds support for Map's ItemSelector field and deprecates parameters.

With the release of Distributed Maps, AWS StepFunctions has released a few new fields, and deprecated two old ones for Map states. One of them was Iterator which was replaced with ItemProcessor, the other one is Parameters (replaced by ItemSelector). A similar PR was made to deprecate Iterator (#27913). While they are deprecated, these fields are still supported (PR reflects that)

ItemProcessor and ItemSelector are both fields that are supported in DISTRIBUTED and INLINE mode, hence why they were added to the existing Map construct

Closes #23265

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[scanlonp]

A couple nits + you should use assertions in the integ test. Otherwise looks good to me!

[scanlonp]

Does $ have a significance as a default? Can this docstring be descriptive?

[abdelnn]

$ represents the entire state input in Step Functions. Because this is essentially a replacement of parameters, I kept the docstring the same as what it was for parameters.

Pull request has been modified.

[scanlonp]

Good addition! Thanks!

[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).

[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).

Pull request has been modified.

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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).