Add a Python library interface

[Saethox]

On the long-term, we could make MAHF usable as a Python library, using PyO3. This is in backlog for now, as the API of MAHF may still change somewhat.

The concrete implementation will probably then be hosted on another repository, but this issue should serve as a reminder. We probably don't need to much to support this interface, except converting 'static lifetimes from structs such as Configuration into less restrictive lifetimes, because they don't play well with Python's memory management.
But this is an issue for another time.