[whatwg/fetch] Add proxy support to obtain a connection (#1259)

This uses some of the language added to #1244 but ports it to "obtain a connection" instead. The one thing that's missing a bit is how _proxy_ is supposed to be used. @ricea can you help with that?

@yutakahirano this also includes your suggested change to the "obtain a connection" parameters by merging _forceNew_ and _dedicated_.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1259

-- Commit Summary --

  * Add proxy support to obtain a connection

-- File Changes --

    M fetch.bs (95)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1259.patch
https://github.com/whatwg/fetch/pull/1259.diff

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