stepfunctions-tasks: support for bedrock createModelCustomizationJob task

[badmintoncryer]

Describe the feature

AWS stepfunction supports bedrock optimized integrations.
Currently, only invokeModel is supported by CDK, but I would like createModelCustomizationJob to be supported in the same manner.

Use Case

This would be helpful when wanting to execute createModelCustomizationJob as a single task in Step Functions.

Proposed Solution

No response

Other Information

No response

Acknowledgements

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

CDK version used

2.123.0

Environment details (OS name and version, etc.)

irrelevant

[pahud]

Thank you for your feature request and upcoming PR!

[github-actions]

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