Replace the request library

[brecke]

The request library is deprecated and holds several security vulnerabilities. Alternatives to be chosen from this list

EDIT: Here's another one: https://github.com/nodejs/undici

EDIT: We could just use node-fetch, but it lacks callbacks

TODO:

• Replace in oae-rest
• Replace in Hilary
• Test failing: verify folder ids can be specified when creating content

EDIT:

This is a promise-only library, so... we'll need to implement #2092 first. Oh well.