Decide whenever we want to use type hinting

[aleksanderczerwionka]

If we want to use type hinting, we should fix current code base and use static type checking before PR. We need to research best way to type check(e.g. mypy .), maybe add it to Actions before merge.

[aleksanderczerwionka]

@kobryl Can you confim whenever it's reasonably easy to add this to git actions?

[kobryl]

I also wanted to raise that issue. I think we should use type checks

[kobryl]

After rethinking, it's low priority - it'll be done if we have enough time