Chalice local and test can use files not packaged by deploy

Some files had been added to the project directory (not in chalicelib), and been imported in app.py. The app passed tests and worked on local, but then failed when deployed (since the required files were not packaged). Not sure if there's a way to flag when we're importing files that aren't going to be packaged on deployment?

Start with app.py and compare how local, test, and deploy handle files outside chalicelib that are imported by the app. Trace which project files deployment packages, then define completion as a warning or test that identifies imports of files omitted from the deployment package.

Written by the indexing model from the issue text.