Integrate and automatically install kodi-stubs

[razzeee]

https://github.com/romanvm/Kodistubs should be pulled from pip by default
And can we somehow set them up by default?

@romanvm

[romanvm]

Honestly, I'm not sure how Kodistubs can be integrated with the addon generator. BTW, I've never submitted them to PyPI because pip can install from a git repo just fine.

[razzeee]

We can do the same, for example like it's done here:
https://github.com/vadimadr/generator-djdj/blob/bc622a4c89173f5f0d7e3e6a8e89aa4b257015f0/generators/app/index.js#L306-L316