Enable cli completion

[klippo]

Enables the --generate-bash-completion flag provided by urfave/cli

Documentation can be found at https://github.com/urfave/cli/blob/main/docs/v2/examples/bash-completions.md

Completion scripts can be found at https://github.com/urfave/cli/tree/main/autocomplete

[SSvilen]

This feature would be greatly appreciated..