Missing execution-result in CodePipelineEventDetail

[guiminyao]

Is your feature request related to a problem? Please describe.
The CodePipelineEventDetail doesn't have the field for ExecutionResult.
See https://docs.aws.amazon.com/codepipeline/latest/userguide/detect-state-changes-cloudwatch-events.html

Describe the solution you'd like
Add a new type and new field to the struct.

Thanks