Migrate away from vorpal

What problem would this feature solve?

Vorpal has not been updated in four years, its dependencies are out of date and give our users vulnerability notices when installing Fractal.

This should also fix a deprecation warning users get when installing Fractal:

npm WARN deprecated core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.

└─┬ @frctl/fractal@1.4.1
  └─┬ vorpal@1.12.0
    └─┬ babel-polyfill@6.26.0
      ├─┬ babel-runtime@6.26.0
      │ └── core-js@2.6.11  deduped
      └── core-js@2.6.11 

What the feature should look like?

Fractal’s CLI module should be updated to use something other than vorpal.

[Chapabu]

Just some progress on this. I’ve got the info and build commands working as part of the monorepo examples. Working on the serve command and the new command this week - although I reckon the fractal new command might be the tricky one. After that, it’s just tests - so probably a week or two then this one can be checked off.

[Chapabu]

@mihkeleidast I’ll pick this one back up - I think I’ve got a local branch with a fair amount of the work in it, and it’d be good to get back into the weeds.