[whatwg/fetch] Copy client-hints list from env settings object. Align CH processing (#773)

This PR tackles a part of https://github.com/whatwg/fetch/issues/726, by copying the request's client-hints list from the environment settings object's one (as defined in https://github.com/whatwg/html/pull/3774). It also aligns the addition of CH headers to current implementations, and adds the Device-Memory, RTT, Downlink and ECT hints.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/773

-- Commit Summary --

  * Copy client-hints list from env settings object. Align CH processing

-- File Changes --

    M fetch.bs (25)

-- Patch Links --

https://github.com/whatwg/fetch/pull/773.patch
https://github.com/whatwg/fetch/pull/773.diff

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