feat(stepfunctions): support string and file definitions

[hoegertn]

This change to AWS CDK will allow for the easier design of workflows by using the workflow studio. The visual representation of workflows is more attractive and easier to understand for developers and business people. Additionally, this change will address related issues in the CDK, improving the overall functionality and user experience. Adding the definitionBody and definitionSubstitutions props and the union-like class DefinitionBody will make it easier to define workflows using this tool by allowing users to define workflows in different ways, such as from an external file or a string.

Closes #8146.
Refs: #18880

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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

• Base implementation
• Unit tests
• Integ tests
• Readme update

[hoegertn]

Tests will follow soon. Need to make sure I can compile as Gitpod now crashes with OOM errors after the restructure.

[aws-cdk-automation]

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[hoegertn]

I am still working on it.

[gitpod-io]

[aws-cdk-automation]

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

[hoegertn]

I was not able to run the integ test. Gitpod threw errors about not finding some modules.

[aws-cdk-automation]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 1421365
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This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

[mrgrain]

I was not able to run the integ test. Gitpod threw errors about not finding some modules.

Exemption Request

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This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

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[aidansteele]

@hoegertn This looks good, I hope to see it merged. I'm re-familiarising myself with CDK (I haven't used it for a while) so this might be a silly question: will it also work with state machine definitions authored in YAML? Or only JSON?