Feature: Get info about API calls from function call

[timo-at-lanalabs]

When making an API call such as
df = api.aggregate(log_id, metric="duration", aggregation_function="mean")
the function call returns a result but the underlying call that is being made is not easy to follow.

For debugging purpose it would be helpful in my mind if we allow for a flag such as dev=True, which then returns us the components of the api call such as the header, the body and the endpoint, so that debugging is easier.