Call a Python function from ysv

[anatoly-scherbakov]

Depends on: #58

integrations:
    python:
        interpreter: python3.8
        module: my_python_module.ysv_functions
columns:
    - first_name:
        - python: fake_first_name
        - uppercase

integrations key permits us to support multiple integrations with different programming languages. If at least one python command appears in the ysv configuration, the system must spawn a Python interpreter attached to every worker thread.

Python module specified in the module argument will be imported into that interpreter.

For every cell, specified Python function will be called, and the result of its execution will be used as cell value.