Local environment with RIE and funcion names

Hi,

I have been using your interface extensively to build a suite of Lambda apps. Our architecture encompasses several Lambda functions, that are supposed to talk to each other via the [boto3](https://boto3.amazonaws.com/v1/documentation/api/latest/index.html) Python client. Thus far, I'm handling everything with HTTP ports on localhost, having a slightly different code base from the actual one that will be hosted on AWS.

Is it possible to have named Lambda functions within RIE, in order to use `invoke` calls via the boto3 Python client?

Start by reviewing the RIE behavior for local HTTP invocation and the issue's boto3 `invoke` use case. Determine how named Lambda functions could be represented and routed between local processes; done means multiple locally running functions can call one another through boto3 without a separate HTTP-specific code path.

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