Support Before / After Execution Hooks for CDK Operations

[sherl0cks]

I'm interested in some sort of hooks framework added to the CDK so that one can declare logic to execute after / before a cdk command. This would leave the use experience tied to the CDK user experience, instead of wrapping it in shell scripts etc.

Use Case

1. Authentication workflows, especially until SSO works correctly.
2. Creating .env files for local testing to know which resources to use after cdk deploy (e.g. a lambda or dynamo table to invoke)
3. Emptying s3 buckets before cdk destroy

Proposed Solution

I don't have one, but ansible does this and its really useful https://github.com/openshift/openshift-ansible/blob/master/HOOKS.md

This is a 🚀 Feature Request

[eladb]

Duplicate aws/aws-cdk-rfcs#71

[github-actions]

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