Add stubs for gunicorn

[eugeneliukindev]

Source: https://github.com/benoitc/gunicorn
PyPi: https://pypi.org/project/gunicorn/
Issue: benoitc/gunicorn#1393

[eugeneliukindev]

If possible, please tell me how to correctly import library components without stubs.
The only way I used:

from eventlet.greenio import GreenSocket  # type: ignore # pyright: ignore # noqa: PGH003
from eventlet.wsgi import local  # type: ignore # pyright: ignore # noqa: PGH003

But I understand that it doesn't look nice.

[brianschubert]

If possible, please tell me how to correctly import library components without stubs

Unfortunately you can't. You can can replace these with placeholder types (good choices are an @type_check_only Protocol or a named alias for Any) with a comment mentioning what type it represents.

[eugeneliukindev]

@brianschubert Done!

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/worker.py:38: error: Unused "type: ignore[misc, no-any-unimported]" comment  [unused-ignore]
+ aiohttp/worker.py:71:13: error: Statement is unreachable  [unreachable]
+ aiohttp/worker.py:71:13: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-unreachable for more info
+ aiohttp/worker.py:75:26: error: Too few arguments  [call-arg]
+ aiohttp/worker.py:75:26: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-call-arg for more info
+ aiohttp/worker.py:75:26: note: "wsgi" is considered instance variable, to make it class variable use ClassVar[...]
+ aiohttp/worker.py:117: error: Unused "type: ignore" comment  [unused-ignore]