feat: Enable Eventbridge Execution Status Change Event

[danielpoonwj]

Purpose

AWS Step Functions emits EventBridge events on execution state changes (docs here). This is particularly useful when kicking off other tasks when an execution starts or fails, and there's no way to currently test this functionality locally.

Approach

Step Functions Local itself does not seem to support this functionality, but we can infer the state changes from the logs and fire the respective events.

The event details aren't fully implemented:

• startDate for all events except ExecutionStarted There's no information on a specific log line on when the execution started. It can only populate stopDate for these end states.
• input and output There's some logic involved in whether the details are shown (docs here). But if there's a feature request for this information it shouldn't be impossible to implement.

[codetheweb]

LGTM, thanks.

[codetheweb]

Published in v0.1.8.