[whatwg/fetch] Refactor forbidden request-headers (PR #1541)

This change makes several changes:

* Makes "get, decode, and split" callable with a value. This is generally not advisable so this is not exported.
* Generalizes forbidden header name to forbidden request-headers so it can target values for specific headers.
* Takes advantage of that for X-HTTP-Method, X-HTTP-Method-Override, and X-Method-Override.

Tests: WPT fetch/api/basic/request-forbidden-headers.any.js.

XHR PR: TODO.

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   * Deno (not for CORS changes): N/A?
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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1541


-- Commit Summary --

  * Refactor forbidden request-headers

-- File Changes --

    M fetch.bs (257)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1541.patch

https://github.com/whatwg/fetch/pull/1541.diff


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