Type hints in cli modules

[mooncrosser]

Abstract

#81 point 7

Adding type hints in CLI module

Action Taken

I've added type hints in the CLI module, I think I got most of them correct but review carefully. With this change, mypy shows 140+ errors, so there's a bunch of refactoring to be done.

[pm5k]

You're going to hate me, but in terms of using anything from typing the common practice is to import each item individually, rather than importing typing and then using typing.TYPE in signatures.

I.E:

from typing import (Any, Callable, Union, ..)

def something(func: Callable[..., str], something: Union[str, int]) -> str:
    pass

The main reason for it is because we don't wanna bloat the actual code, and imports won't actually bloat that much, because frankly - how many different types do we normally use, right?

Please can I ask you to amend the commits to align with this?

[pm5k]

OOS & OOD