http: rewrite to use new helper functions

[josephjclark]

With the introduction of new http helpers based on unidici, we need to re-write language-http to use the new helpers.

It should also use the new expandReferences utility function.

At the time of writing, we will need to handle expandReferences if options.body is a stream. I think is it reasonable to add logic for this in the new expandReferences utility (ie, don't recurse into a stream object, which we should be able to duck type)

This is a major version bump as the axios export and axios APIs are being removed.

I would like to change the http signatures as little as possible I think - so we should still have get(path, params, callback).

We will have to go through mapToAxiosConfig and decide which properties to maintain and which to drop. I would prefer to support a much smaller API.

It may be helpful to review existing http job code to get a sense of how difficult migration is going to be.