[whatwg/fetch] Proposal: `Response.json` helper (Issue #1389)

The `Response` object currently has a `Response.redirect` helper method to create `Response` objects with preset `Location` headers. `Request` and `Response` already have a `json` prototype method that allows parsing bodies as JSON, but there is currently no trivial way to **create** JSON `Response` objects directly from a POJO.

I propose the addition of a `Response.json(obj, opts)` static method that creates a `Response` object with a body string containing the JSON serialized representation of `obj`. `opts` would allow further modification of the JSON response, namely setting headers and status code. By default the status code is 200, and the headers are the default response headers + `content-type: application/json`.

```webidl
interface Response {
  [NewObject] static Response json(any object, optional ResponseInit init = {});
}
```

The motivation for this addition is that in server side runtimes using WHATWG `Request` and `Response` objects, folks often create helper methods for this behaviour that need to be duplicated across each project. This being built in would be very useful.

Thoughts?

Implementer interest:
- Chromium :grey_question:
- Firefox :grey_question:
- Safari :grey_question:
- Deno :heavy_check_mark: 
- Cloudflare Workers :grey_question:

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