[Feature Request] Shell completion

[KevinMX]

This comes to my mind few days ago when I was using another program, which offers this feature.

As ruyi CLI already has many functions, shell completion might come in handy.

e.g.

# Generate autocompletion script for ruyi and write to .bashrc, or maybe other shells, e.g. zsh, fish
$ ruyi completion bash >> ~/.bashrc
$ source .bashrc
$ ruyi <TAB>
    device              Manage devices
    extract             Fetch package(s) then extract to current directory
    install (i)         Install package from configured repository
    list                List available packages in configured repository
    news                List and read news items from configured repository
    update              Update RuyiSDK repo and packages
    venv                Generate a virtual environment adapted to the chosen toolchain and profile
    admin               (NOT FOR REGULAR USERS) Subcommands for managing Ruyi repos
    self                Manage this Ruyi installation
    version             Print version information
$ ruyi device <TAB>
    provision  Interactively initialize a device for development
$ ruyi device -<TAB>
-h, --help   show help message and exit
...

Something like that.