Type annotations for hash, show and wheel in commands

[deveshks]

Towards #4748

Added type annotations to pip._internal.commands.hash, pip._internal.commands.show and pip._internal.commands.wheel

[deveshks]

Hi @McSinyx , @pradyunsg , @sbidoul

This is my next attempt on adding mypy annotations on some other files in pip._internal.commands submodule, and since you guys helped me to get the last PR related to this effort (#7977) in shape, I would appreciate if you guys could look at this and provide your thoughts 😊

[McSinyx]

Hi, I don't think I'm in the position for my words to be seen as reviews, but more like personal thoughts:

1. I'd much prefer fewer newlines, e.g. right after type comments. This is to reflect PEP 8:

   Use blank lines in functions, sparingly, to indicate logical sections.

2. It is possible to type hint args and kwargs as, for example (*Any, **Any) -> None. This is more consistent with Python 3.5+ annotation of foo(*args: Any, **kwargs: Any) -> None, just in case we drop Python 2 support sometime in the future.

[deveshks]

Thanks @McSinyx , I have removed the newlines after type comments.
I myself am not sure of using the (*Any, **Any) -> None notation, so I have left it as is. I will wait for other reviewers to comment on that switch

[gutsytechster]

With respect to comment here #8016 (comment), I think you can make a few changes described below. :)

[deveshks]

I have applied to suggested changes to the PR. If they look good, could I please get this PR approved?

[sbidoul]

A small nit, otherwise LGTM.

[deveshks]

A small nit, otherwise LGTM.

Thanks for the approval @sbidoul 😊