feat(cli): refactor invite/invitations/accept/decline commands

[superhawk610]

Description

This PR refactors the invite, invitations, accept, and decline commands as described in #95.

• split output from ds invitations into either packages or namespaces depending on presence of --packages flag
• add support for --namespace flag to ds invite
• add support for --package flag to ds invite
• add support for --namespace to ds accept
• add support for --package/--as to ds accept
• add support for --namespace to ds decline
• add support for --package/--as to ds decline

Additionally, it includes a couple of other small tweaks:

• refactor cli option parsing to allow command name to come after flags
• store username in addition to token when logging in via ds login
• fallback to ds help if the provided command isn't found

Notes

Closes #95.

[superhawk610]

This currently does nothing since the payload returned by profile.loginWeb only contains a token key. This should be extended in services/registry/handlers/auth.js.

[ceejbot]

SO Chris just changed the API out from under you in PR #135. Specifically, namespace memberships are now under /v1/users/user/:username/memberships and package maintainerships are now all /v1/packages/package/:namespace([^@]+)@:host/:name/maintainers. HOWEVER <3 for this, because ugh my first take on those cli commands was a mess.

Update endpoints and I will land this!

[superhawk610]

@ceejbot done! You may want to double check my routing but I believe that should do it.

[ceejbot]

Thank you!

[ceejbot]

@all-contributors add @superhawk610 for code

[allcontributors]

@ceejbot

I've put up a pull request to add @superhawk610! 🎉

[olingern]

@superhawk610 I'm seeing this on master ( node 12.3.0 )

> node ./lib/main.js whoami
Cannot destructure property `registries` of 'undefined' or 'null'.

Cool if I fix over here #234 ?

[superhawk610]

@olingern oops, looks like I forgot to pass opts to whoAmI in cli/lib/commands/whoami.js. Yeah if you've already got something open go for it.