[whatwg/fetch] Add more parameters to "obtain a connection" (#1171)

Add more parameters to the "obtain a connection" operation, as we want to create a WebTransport over HTTP/3 connection for WebTransport.

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- [ ] At least two implementers are interested (and none opposed):
   * Chrome
   * Firefox
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * We'll test this as part of WebTransport
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * N/A: This is an infrastructure change needed by WebTransport

(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/1171

-- Commit Summary --

  * wip
  * fix
  * fix

-- File Changes --

    M fetch.bs (34)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1171.patch
https://github.com/whatwg/fetch/pull/1171.diff

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