Design an unified interface for api and cli calls

[Costya-Y]

Issue details

AS a Developer I would like to have an API, which I can trigger from my code.

Steps to reproduce

I want to be able to do something like:

from shellfoundry import bootstrap

def call_shellfoundry_install(self, path)
    bootstrap.install(path)

Thanks!

Affected version:

Upcoming one

Affected platforms

• Windows
• Linux