Adds the missing dependencies `google-i18n-address`, `pycountry` and
`html5lib` from the `pythonPackages` subtree.
See also https://hydra.nixos.org/build/86535305
The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.
While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.
