add ability to build from local PKG-INFO file

[huakim]

Before I will be even looking at diff, could I ask for git rebase -i and rearranging commits to some meaningful units with proper commit messages?

https://who-t.blogspot.com/2009/12/on-commit-messages.html

I can, but lasy, code just work, and there isn't much changes done, just added two functions 'pypi_text_file' and 'pypi_json_file', also added --local, --localfile and --source-extension for generate subcommand. The --local flag indicates, that py2pack should fetch data from local file such as '{name}.egg-info/PKG-INFO' by default, --localfile indicates direct path to the local file. --source-extension is extension for source, if no source url is provided, by default it takes value '.zip'. Also, i merged commits from danigm user (https://github.com/openSUSE/py2pack/pull/178), who did patch for using build.project_wheel_metadata to extract more metadata when it's not using setuptools and the metaextract package is not useful. There changes provided as is, with no any responsibilities, just for meself

[mcepl]

just for meself

If you made changes just for yourself, then I don’t know why you submitted it here.