[core] create and execute venv

[rudolfix]

Implement a module that allows to create python virtual environments and execute processes with it

1. should create venv based on actually used interpreter
2. allows to install a list of dependencies in requirement format
3. should allow executing python script in it
4. implement context manager for ad hoc created venvs

example:
https://gist.github.com/mpurdon/be7f88ee4707f161215187f41c3077f6