[whatwg/fetch] Add `"json"` destination, for JSON modules (PR #1691)

The import attributes TC39 proposal has been updated so that HTML can use the expected type (unspecified, `json`, `css`) to affect the fetch request. This PR introduces the `"json"` destination, that will be used to fetch `import "..." with { type: "json" }`.

Ref https://github.com/whatwg/html/pull/9486#discussion_r1273195679, https://github.com/whatwg/html/issues/7233

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno (not for CORS changes): …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …

(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/1691

-- Commit Summary --

  * Add `"json"` destination, for JSON modules

-- File Changes --

    M fetch.bs (14)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1691.patch
https://github.com/whatwg/fetch/pull/1691.diff

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