Make PR based deploys to AWS

[mishraomp]

Currently it is deploying to dev on merge
Ideally there would be no dev, it would be PR to TEST
each PR will have its own environment.
challenge would be to see how to play nicely with RDS.

[mishraomp]

idea,
fire a lambda function in pr open to create a new database in aurora instance for the pr deployment to use, the lambda function execution will be a need for the api to deploy.
fire a lambda function in pr close to drop the database in aurora for the pr

add pr env destroy to remove ecs cluster and cloudfront distribution when pr is closed or merged

similar pattern to what we have in QSOS with crunchy, each PR gets a database within same crunchy instance.

@DerekRoberts

fyi @marcellmueller