Add new decorator to pass a CloudEvent object to a handler function

Description

Add a new decorator to the framework that mirrors the behaviour of the existing cloud_event handler. The handler should return the data portion of the CloudEvent to the calling handler.

Further details

This decorator should live under a cloud_events module, and should be responsible for wrapping a handler function, to return the contents of the data in the CloudEvent parsed to the function.

Task list

Acceptance criteria

• Handler exists in separate module to pass CloudEvent messages to a handler function, building on the functions_framework.cloud_event function

Links/references