TYP: annotation of __init__ return type (PEP 484) (pandas/utils)
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).

According to [documentation](https://pandas.pydata.org/docs/dev/development/contributing_codebase.html#type-hints) pandas uses [PEP484](https://www.python.org/dev/peps/pep-0484/) for type hints.
PEP484 states that `__init__` function should have `-> None` return type annotation.
In this PR I added return type annotation to `__init__` functions in `pandas/utils` module.
Thanks!

@nafarya Hi! Thanks for this! I'm wondering if there is a way to configure our code checks so that this is caught automatically? ie can black or flake8 somehow catch this? That seems like the golden standard, if possible, so that the **entire** codebase is consistent. > @nafarya Hi! Thanks for this! I'm wondering if there is a way to configure our code checks so that this is caught automatically? ie can black or flake8 somehow catch this? That seems like the golden standard, if possible, so that the **entire** codebase is consistent.

Hi! Thats great idea and I think it should be possible! Maybe it could be done the same way as you check for [PEP 8](https://www.python.org/dev/peps/pep-0008): via https://github.com/pep8speaks Floated the idea to black here: https://github.com/psf/black/issues/2913 Please wait for https://github.com/pandas-dev/pandas/pull/46283#discussion_r823143278 thanks @nafarya 