missing Python distribution metadata

System Information

version: 4.8.0
Operating System: Guix System
Compiler: GCC 10.3.0

Detailed description

Python libraries/packages must come with a name-version.dist-info directory containing files such as METADATA [0], but this packages doesn't install any.

[0] https://packaging.python.org/en/latest/specifications/recording-installed-packages

Because of this, libraries such as pkg_resources.find_distributions (or the modern equivalent, I suppose: https://github.com/pypa/packaging-problems/issues/664) fail to notice its existence.

Steps to reproduce

1. install opencv
2. Run this at the interpreter:

import pkg_resources
ws = list(pkg_resources.find_distributions('/path/to/your//lib/python3.10/site-packages/'))
pkg_resources.require('opencv-python')

3. Observe it fails with:

DistributionNotFound: The 'opencv-python' distribution was not found and is required by the application

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)