[fetch] Treat Last-Event-ID and Client-Hints headers as simple headers (#258)

- Last-Event-ID is defined in the HTML spec as a utf-8 string, hence we
  don't place any restrictions on its value
- Each Client Hints header has a BNF grammar that should be validated by
  the user agent; the header is defined as simple if the name of the
  header matches one of CH header names, and its value conforms to the
  defined grammar

Closes:
- https://github.com/whatwg/fetch/issues/52
- https://github.com/httpwg/http-extensions/issues/141
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/258

-- Commit Summary --

  * treat Last-Event-ID and Client-Hints headers as simple headers

-- File Changes --

    M Overview.src.html (24)

-- Patch Links --

https://github.com/whatwg/fetch/pull/258.patch
https://github.com/whatwg/fetch/pull/258.diff

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