Step Functions support

Idea from this tweet https://twitter.com/__steele/status/1605385239261372417?s=20&t=157smlDcbfcVx7vFNIK0zQ

"I would easily pay $100 for my dream AWS Step Functions app. It would be similar to the SFN web console, but also:

* Log output from all invoked functions (with ability to search / query my structured logs)

* Bubble up info from child executions, without needing lots of tabs"