Add PyPI package size badges

:clipboard: **Description**

Hi! I couldn't find a badge for python package size

And I propose to add a badge with python package size on PyPI. As it is done for the same [docker images](https://shields.io/badges/docker-image-size)

If this has already been suggested and/or it was decided not to use it, I have not found such an issue

### In additional
most likely, `GET` requests in PyPI are used to get the information. Then the information about the size can be obtained by https://pypi.org/pypi/requests/json

Start by comparing the linked Docker image size badge with the proposed PyPI JSON endpoint at https://pypi.org/pypi/requests/json. Determine how the package size should be selected and displayed, then inspect the existing badge implementation and tests for the closest package or registry badge. Done means a PyPI package-size badge is implemented and covered by tests.

Written by the indexing model from the issue text.