Support kms-key-arn config in lambda functions.

In the lambda deploy aws cli you can do:

[--kms-key-arn ]
The ARN of the AWS Key Management Service (AWS KMS) key that's used to encrypt your function's environment variables. If it's not provided, AWS Lambda uses a default service key.

I would expect the code here to take the variable from the config.json:

https://github.com/aws/chalice/blob/master/chalice/deploy/deployer.py#L694

But it isn't there. Is there another way?

Read chalice/deploy/deployer.py around line 694 and compare the Lambda deployment options with the config.json handling described in the issue. Trace how function configuration reaches the AWS CLI, then verify that a configured KMS key ARN is reflected in the deployment request; the issue names no test file, so locate the relevant deployment tests before confirming the change.

Written by the indexing model from the issue text.