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

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

[gitpod-io]

[hoegertn]

New PR for #24900 as this got closed by the automation

Exemption Request I was not able to run the integ tests in Gitpod. Will try again.

[aws-cdk-automation]

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[aws-cdk-automation]

This PR cannot be merged because it has conflicts. Please resolve them. The PR will be considered stale and closed if it remains in an unmergeable state.

[aws-cdk-automation]

This PR cannot be merged because it has conflicts. Please resolve them. The PR will be considered stale and closed if it remains in an unmergeable state.

[aws-cdk-automation]

This PR has been in the CHANGES REQUESTED state for 3 weeks, and looks abandoned. To keep this PR from being closed, please continue work on it. If not, it will automatically be closed in a week.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: f284ad3
• Result: FAILED
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[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.

[aws-cdk-automation]

The pull request linter fails with the following errors:

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