Make it easier to run Enos-Kubernetes programmatically through Python (e.g. with a notebook)

Some people like to automate calls to Enos-Kubernetes instead of using the CLI. This is good for reproducibility.

Currently, it is a bit hard to call Enoslib tasks from Python.

We should look at providing a proper Python API, and then make the tasks simple wrappers around this API. This will allow advanced users to call the Python API directly.

And write documentation about it!