step_functions: Support new (8/31/2022) intrinsic functions

[dschultz0]

Describe the feature

The Amazon States Language used by Step Functions recently added a number of very useful intrinsic functions that aren't currently supported by the CDK: https://states-language.net/#2022-08-31

• States.ArrayPartition
• States.ArrayContains
• States.ArrayRange
• States.ArrayGetItem
• States.ArrayLength
• States.ArrayUnique
• States.Base64Encode
• States.Base64Decode
• States.Hash
• States.JsonMerge
• States.MathRandom
• States.MathAdd
• States.StringSplit
• States.UUID

When we try to use these functions, the CDK (Python variant) returns the following error indicating that the only supported functions are those present before the update:
RuntimeError: Error: JSON path values must be exactly '$', '$$', start with '$.', start with '$$.', start with '$[', or start with an intrinsic function: States.Format, States.StringToJson, States.JsonToString, or States.Array. Received: States.MathAdd($.successful_count, 1)

Use Case

These updates to the States Language are a big step forward in improving the utility of Step Functions, particularly when integrating with a range of AWS services, so it would be incredibly valuable to have them available for inclusion in our workflows.

Proposed Solution

Adding these functions to JsonPath would be useful, although a simple solution would be to add them to the allowed values shown in the error message above so that we can simply use JsonPath.string_at("States.MathAdd($.successful_count, 1)").

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.47.0

Environment details (OS name and version, etc.)

Windows 11 and Amazon Linux

[kaizencc]

#22431 looks to be attempting to add support for this

[github-actions]

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[github-actions]

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