Improvement of the CLI tool

[zeljkobekcic]

This branch moved from the argparse package to the de-facto standard for argument parsing (cobra + viper). We are now able to:

• generate documentation
• auto-completion for different shells
• auto-suggestion on a typo in a command
• read env as alternative to flag without manually written code
• provide examples for each command separately and show them in the docs

Everything about the CLI is now in one place.

Furthermore we need to:

• adapt the ci pipeline to automatically generate the docs and push it to the wiki
• adapt the builds to include the auto completion in the releases, especially the linux builds such that the users get everything out of the box

[Ninja243]

lgtm!