Enable runtime autocompletion of arguments in minder

[rdimitrov]

Cobra allows to have runtime autocompletion of arguments. This will be very nice to have since it will improve the UX of the CLI and minder in general.

Example: In case of double-tab on

minder profile delete

the user will be presented with a list of its profiles they can choose and autocomplete on -

minder-profile-1 quickstart-profile

Caveat:

The caveat here is that it seems we use flags for everything, so this will imply changing some of the flags to arguments.

References:

• https://blog.devgenius.io/shell-completion-with-cobra-and-go-c8368074d8f7