[whatwg/fetch] Add `Response.json` static method (PR #1392)

This commit adds a `Response.json` static method that can be used to
create well formed JSON responses will very little effort.

There are still some open questions:

- **Should the JSON be minified or pretty printed?** Precedent in web platform APIs would say minified (e.g. WebCrypto JWK serialization), but the wider ecosystem usually prefers 2 space pretty printing (e.g. https://api.github.com).
- **Does the name conflict with the `Body.json` prototype method?** If so, let's rename to `Response.fromJSON` (naming style follows [`Array.fromAsync`](https://github.com/tc39/proposal-array-from-async)).
- Are browsers interested (and if they are not, will they implement this)?

Closes #1389

---

- [ ] At least two implementers are interested (and none opposed):
   * Deno
   * Cloudflare Workers
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * (coming soon)
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: …
   * Safari: …
   * Deno: …

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1392


-- Commit Summary --

  * Add `Response.json` static method

-- File Changes --

    M fetch.bs (47)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1392.patch

https://github.com/whatwg/fetch/pull/1392.diff


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