feat: Add shell completion and manpages generation

Wiktor Kwapisiewiczrequested to merge
wiktor/signstar:wiktor/add-shell-man into main

This PR adds two commands to the justfile:

  • just generate shell_completions nethsm-cli
  • just generate manpages nethsm-cli

It also makes the nethsm-cli expose a minimal set of APIs for exposing CLI interface for clap_allgen.

Fixes: #45 (closed)

Edited by Wiktor Kwapisiewicz

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