[whatwg/fetch] Support ServiceWorker Static Routing API (PR #1737)

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We propose [ServiceWorker static routing API](https://github.com/WICG/service-worker-static-routing-api), which allows developers to configure routing, and offload things ServiceWorkers do. The main spec update is in https://github.com/w3c/ServiceWorker/pull/1701, but some behavior involves the fetch spec change (specifically, "race-network-and-fetch-handler" option).

- [ ] At least two implementers are interested (and none opposed):
   * Chrome is proposing this change https://groups.google.com/a/chromium.org/g/blink-dev/c/-SEMMttEqz4
   * Mozilla https://github.com/mozilla/standards-positions/pull/894
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://github.com/web-platform-tests/wpt/tree/master/service-workers/service-worker/tentative/static-router
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: [crbug.com/40241479](https://crbug.com/40241479)
   * Gecko: …
   * WebKit: …
   * Deno (not for CORS changes): …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
- [ ] 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. -->

(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/1737

-- Commit Summary --

  * Add service-workers race token to request and its lookup
  * Use [=lookup-race-response=]

-- File Changes --

    M fetch.bs (3)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1737.patch
https://github.com/whatwg/fetch/pull/1737.diff

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