APIGateway configuration

I may have missed but I couldn't find any way to configure APIGateway, and particularly the schemas.

Since schemas are usually very close to models, it would be nice to be able to associate a schema to a route inside app.py, rather than packaging and doing it in sam.json

This is the only step i need to truly have a one command deploy of my chalice app.

Thoughts?

Start by reviewing how routes and schemas are represented in app.py and how the current packaging is handled in sam.json. Determine the configuration design needed to associate schemas with routes in app.py, with done meaning a Chalice app can deploy the API Gateway configuration in one command without separately packaging it in sam.json.

Written by the indexing model from the issue text.