[whatwg/fetch] Add Accept-CH-lifetime cache and CH header handling (#729)

This PR adds the concept of an Accept-CH cache as well as some handling for the `Accept-CH` and `Accept-CH-Lifetime` headers.
Tackles some of the concepts that need defining in https://github.com/whatwg/fetch/issues/726
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/729

-- Commit Summary --

  * Add Accept-CH-lifetime cache and header handling

-- File Changes --

    M fetch.bs (54)

-- Patch Links --

https://github.com/whatwg/fetch/pull/729.patch
https://github.com/whatwg/fetch/pull/729.diff

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