[whatwg/fetch] WIP: Cancelation (#523)

Just looking for early feedback right now.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/523

-- Commit Summary --

  * Adding interfaces and simple cancelation

-- File Changes --

    M fetch.bs (51)

-- Patch Links --

https://github.com/whatwg/fetch/pull/523.patch
https://github.com/whatwg/fetch/pull/523.diff

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