[WIP] Add directory-named-babel-plugin

[jtoar]

This PR stubs out some of what adding the directory-named-babel-plugin (plan of attack in #641) would entail.

Once added, given two services, contacts and notes, we can import from the directory instead of the file. Here's a diff of the actual vs the intended behavior:

// api/src/services/notes/notes.js

-import { contacts } from 'src/services/contacts/contacts
+import { contacts } from 'src/services/contacts'

Related issues:

• Use directory named babel plugin #641
• babel-plugin-directory-named not available on API side #804

[peterp]

Hey @jtoar, would you mind if I take over this PR?

[jtoar]

@peterp Go for it!

[peterp]

Thanks for this @jtoar! 🙇‍♂️

Closing in favour of: #1102