[whatwg/fetch] Anonymous iframe (WIP) (PR #1416)

Explainer & specs (WIP)
https://arthursonzogni.github.io/anonymous-iframe/#explainer


Summary:
- Plumb environment's`partition-nonce` in the `network-partition-key`. The value is filled
  from the HTML specification.

Anonymous iframe require updating several specifications:
- HTML => https://github.com/whatwg/html/pull/7695

- Fetch => (this)
- CHIPS (cookie-having-independent-partition-state) => XXX
- Storage-partitioning => XXX

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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- [ ] At least two implementers are interested (and none opposed):
   * Chrome: https://chromestatus.com/feature/5729461725036544

   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://wpt.fyi/results/html/cross-origin-embedder-policy/anonymous-iframe

- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: https://crbug.com/1226469

   * Firefox: …
   * Safari: …
   * Deno: N/A
   * Node.js: N/A

(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/1416


-- Commit Summary --

  * Anonymous iframe (WIP)

-- File Changes --

    M fetch.bs (19)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1416.patch

https://github.com/whatwg/fetch/pull/1416.diff


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