Feature Request: make timeout and memory size available in @app.* annotations

The issue#347 added support for timeout, memory size through the config.json file.

I propose that the same settings should be made available through inline configuration annotations i.e. as optional parameters in @app.route, @app.on_sns_message, @app.on_sqs_message, etc

The power of inline configuration is unique to chalice and a big reason I prefer it over the competing framework, "serverless".

A separate file is a maintenance headache, especially when you have multiple stages and multiple endpoints in the same app.py

Start by comparing the existing timeout and memory-size handling in config.json with the inline annotations used in app.py, including @app.route, @app.on_sns_message, and @app.on_sqs_message. Done means those annotations accept the settings as optional parameters and apply them consistently across the supported endpoints and stages.

Written by the indexing model from the issue text.