Add voa config subcommand

After !52 is merged, we want to not only integrate this with voa-openpgp but also provide user-level integration.

For this, we should add at least the following voa subcommands:

  • voa config list: provide a list of all valid configuration files that can be "seen" by the user
  • voa config show os: provide information on what specific technology settings apply to a given OS
  • voa config show context: provide information on what specific technology settings apply to a given context

These commands would greatly help the users understand the system and what applies to their specific context.

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