Use Python type annotations

[rafaelmardojai]

Updated a few modules to use python type annotations so we can establish our criteria on how/where to use them.

[rafaelmardojai]

@fushinari With these modules updated I think we can discuss what we want in the regard of type annotations

[mufeedali]

Anything with a non-default type or variable type (as in str | None for example) should be annotated I think.

[mufeedali]

Also... what do you say to using something like Black?

[rafaelmardojai]

Also... what do you say to using something like Black?

Looks nice. To be honest formatting can become a headache easily, and is very common to fell on inconsistencies along the time.