Describe your idea/feature/enhancement

I wish SAM CLI could import existing CF resources as documented here: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resource-import-new-stack.html#resource-import-new-stack-cli

Specific use case: Destroying a stack leaves some persistent resources (e.g. a database) that could be incorporated into a new stack.

Proposal

Add a --resources-to-import argument to sam deploy.