new version of http that uses fetch

[mtuchi]

Summary

Migrate from using axios to fetch in common.http

1. we have request() in common/util.js that uses fetch() from undici
2. http common to have all http function (get(), post(), head(), patch(), etc) and all these function expandRefences in their arguments.
3. All other adaptors that need access http functions they should use http common function and not implement their own version of get() or post() etc
4. If other adaptors can not use http common function then extend it from common (For example in other adaptors we have create() which is basically a http common post() so it make sense to extend post from http common)

Details

• buildRequest
• buildUrl
• request
• tests

Issues

Ref #283

Review Checklist

Before merging, the reviewer should check the following items:

• Does the PR do what it claims to do?
• If this is a new adaptor, has the migration tool been run and the
  migration guide followed?
• Are there any unit tests? Should there be?
• Is there a changeset associated with this PR? Should there be? Note that
  dev only changes don't need a changeset.

[josephjclark]

Hi @mtuchi - can we put the breaks on this until I've had a chance to really dig into it?

I keep making snap decisions on things without thinking them through - I think maybe we all do - and basically before taking this any further I want to make sure we have a really tight spec about what we want to do, and why.

As part of the issue I'm going to review the new request pattern laid down in template. I've let it sail over me a little bit and I just want to make sure it's right.