Support MediaConnect flow state change events

[JimTharioAmazon]

Is your feature request related to a problem? Please describe.
MediaConnect visualizations should reflect flow state

Describe the solution you'd like
Respond to flow state change events emitted from MediaConnect
Support in a similar way that MediaLive alerts are handled within the solution

Describe alternatives you've considered
n/a

Additional context
https://docs.aws.amazon.com/mediaconnect/latest/ug/monitoring-cloudwatch-events-flow-state-change.html