We are currently relying on pip to install downloaded packages. This requires subprocess calls which is far from ideal.

We can now leverage https://github.com/pypa/build and https://github.com/pradyunsg/installer to replace pip calls.

Initial WIP implementation in python-poetry/poetry#4213