Migrate CLI to https://github.com/spf13/cobra

[chrisdostert]

💥 Proposal

Currently we use github.com/jawher/mow.cli as our CLI framework.

this comes with a few shortcomings that would be nice to overcome; namely:

• no "did you mean [similar command]" when someone typos the command
• no man page generation
• no shell completion generation
• no arbitrary option placement; mow.cli requires you specify a spec for each command, inclusive of opts and args. It doesn't support providing the opts and args out of order. This is sortof a non-ideal UX.
• not as actively maintained or popular as other go CLI frameworks like cobra

It's proposed we move to https://github.com/spf13/cobra which gives us all of the above.