Add an option not to deploy to dev, but only to update the resources in iam, lambda, & apigateway

Hi all,

So far I'm loving chalice, but I've got a use case where my POST workflow is super-complicated (and therefore needs some python code) but my GET workflow can just be a pass-thru to S3. Chalice deletes my resources every time it deploys, which is quite obnoxious when all I really need it to do is update the lambda code and not the apigateway mappings. Any love for such a feature? Let me know if I can/should help implement!

Thanks,
Kyle

Start by tracing Chalice's deployment workflow and how it handles IAM, Lambda, and API Gateway resources. Done means an option updates the Lambda code without deploying to or replacing the API Gateway mappings, while supporting the POST code workflow and the S3 pass-through GET workflow described here.

Written by the indexing model from the issue text.