task: refactor minipass-fetch

[nlf]

minipass-fetch is largely ported code from node-fetch to use minipass streams. we should take a much closer look at it and attempt to clean the code up to be more maintainable, as well as keeping a careful eye out for mishandling of stream errors. there exists a single Promise constructor there that does almost all of the work in a request's lifetime and that should very much not be the case.

[wraithgar]

While not a full refactor we have fixed a good portion of the concerns here.

npm/minipass-fetch#64
npm/minipass-fetch#53