mypy

We need to add .. autosummary:: to pages that need it.
We also need to make sure that this tag renders smoothly.

Usage example: https://github.com/wemake-services/wemake-python-styleguide/blob/ba060dfd18606365d4c09545554b595fce025e79/wemake_python_styleguide/violations/best_practices.py#L16-L17
Docs: https://www.sphinx-doc.org/en/master/usage/extensions/autosummary.html

In Python 3.8, typings doesn't support Annotated. I tried to use typing_extensions Annotated. But it doesn't work.

It has an error.

.../lib/python3.8/site-packages/graphql/type/definition.py", line 769, in fields
    raise TypeError(f"{self.name} fields cannot be resolved. {error}")

TypeError: Tag fields cannot be resolved. Unexpected type 'typing_extensions.Annotated[typing.Unio

When we define a class like this:

def func():
    ...

class MyClass:
    my_func = lambda self, arg: arg

# or
class MyAnotherClass:
    my_func = func

The coverage plugin will consider the my_func as coveraged without any tests.
This behavior is expected because for it the my_func is an attribute!

I think it will be great use the normal signature, this will en