[whatwg/fetch] Add webtransport-hashes to request, wired down to create a connection (PR #1896)

Add an associated webtransport-hashes (a webtransport-hash list) to request, and wire it down to create a connection. For use by WebTransport and CSP https://github.com/w3c/webappsec-csp/pull/791.

Fixes #1880.

- [x] At least two implementers are interested (and none opposed):
   * Chrome, Firefox, Safari
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * PR aims to be behavior neutral with existing tests in https://wpt.fyi/results/webtransport
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed: none revealed as of yet from this change
- [x] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: None planned (aims to be behavior neutral)
- [x] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->


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<a href="https://whatpr.org/fetch/1896.html" title="Last updated on Dec 11, 2025, 7:42 PM UTC (b296f9e)">Preview</a> | <a href="https://whatpr.org/fetch/1896/60e9ff5...b296f9e.html" title="Last updated on Dec 11, 2025, 7:42 PM UTC (b296f9e)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1896

-- Commit Summary --

  * Add an associated webtransport-hashes to request
  * Wire webtransport-hashes concept down to obtain a connection

-- File Changes --

    M fetch.bs (39)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1896.patch
https://github.com/whatwg/fetch/pull/1896.diff

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