Provide CLI Auto Completion Scripts

[sprankhub]

It would be nice to have auto completion scripts for popular shells like:

• Bash
• Fish
• Zsh

Having a look at https://github.com/netz98/n98-magerun2/tree/develop/res/autocompletion could help with this.

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[sprankhub]

This is still relevant and I cannot reopen :-/

[Lunaetic]

I use oh-my-zsh, and opened #280 to address zsh autocompletions.