[whatwg/fetch] Add the "speculationrules" destination (PR #1841)

Part of https://github.com/whatwg/html/pull/11426, for requests initiated by the `Speculation-Rules` HTTP header.

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This should be merged a bit after https://github.com/whatwg/html/pull/11426. Otherwise it will reference the WICG draft.

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- [x] At least two implementers are interested (and none opposed):
   * See https://github.com/whatwg/html/pull/11426
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * We appear to be missing tests for this. I'll work on it.
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * See https://github.com/whatwg/html/pull/11426
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
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<a href="https://whatpr.org/fetch/1841.html" title="Last updated on Jul 10, 2025, 5:11 AM UTC (c649784)">Preview</a> | <a href="https://whatpr.org/fetch/1841/5261b51...c649784.html" title="Last updated on Jul 10, 2025, 5:11 AM UTC (c649784)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1841

-- Commit Summary --

  * Add the "speculationrules" destination

-- File Changes --

    M fetch.bs (12)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1841.patch
https://github.com/whatwg/fetch/pull/1841.diff

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