Added support for Consumer and Supplier functions when executing within AWS Lambda.
It appears that this was previously supported but was removed in 083d5e for some reason.
Improve Consumer support for AWS API Gateway
Consumer type functions, by definition, do not return anything; i.e. they do not have a response. However when executing within a Lambda + API Gateway environment, the Lambda must still return a 200-level status response to signal the API Gateway that the function executed succesfully. I added the logic for this.
Improve Supplier support for AWS API Gateway
Supplier functions, by defnition, do not take input; in the case of API Gateway calls this type of execution passes a null body, which fails to deserialize and throws an exception. I added logic that skips the deserialization of the body in the case it is a Supplier.
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