Response Streaming Lambda support

[mrickard]

Description

AWS introduced response streaming for Node Lambda functions in 2023. Our agent's Lambda instrumentation throws errors when customers wrap these, because the argument order (event, responseStream, context) is different from the traditional functions we instrument (event, context, callback).

The .streamifyResponse method is defined for the Lambda execution environment, on the global awslambda object. When invoked, it returns the original handler function, with an additional symbol added as a property. See https://github.com/aws/aws-lambda-nodejs-runtime-interface-client/blob/main/src/UserFunction.js#L204-L213 ; the symbol is aws.lambda.runtime.handler.streaming.

We can use the presence of this property to detect automatically if the handler is intended to stream a response, and wrap it accordingly, with no additional input needed from the customer.

Acceptance Criteria

This spike should either add response streaming support, or at least determine the scale of any blockers.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-362185