Typing returned config

[lewisjared]

The problem

As a developer I want to be able to use the type hints for configuration in notebooks. This improves the developer experience and may make code easier to refactor in future.

When using pydoit-nb I've started using the following pattern to manually type configuration returned from get_config_for_step_id which is useful.

config_step: RunConfig = get_config_for_step_id(
    config=config, step=step, step_config_id=step_config_id
) 

If typing the return value of get_config_for_step_id is in the too hard basket the above should be the documented pattern.

Definition of "done"

• Type the return value of get_config_for_step_id if possible