Chalice integration does not support the timeout_warning option

[hugoalvarado]

Problem Statement

The ChaliceIntegration does not give warnings about the lambda timeout, which the AwsLambdaIntegration does with the timeout_warning parameter (AwsLambdaIntegration(timeout_warning=True)).

It would be beneficial to also have timeout warnings in the ChaliceIntegration.

Solution Brainstorm

Add timeout warnings to the ChaliceIntegration, which is an option in the generic AwsLambdaIntegration.

[sentrivana]

Thanks @hugoalvarado, I'll put this in our backlog -- but please note that it'll likely be quite long until we get around to doing this. Pull requests are more than welcome though!