[whatwg/fetch] Allow `new Response` with 101 status code (Issue #1759)

### What is the issue with the Fetch Standard?

Currently we say:

> If init["[status](https://fetch.spec.whatwg.org/#dom-responseinit-status)"] is not in the range 200 to 599, inclusive, then [throw](https://webidl.spec.whatwg.org/#dfn-throw) a [RangeError](https://webidl.spec.whatwg.org/#exceptiondef-rangeerror).

A request was recently made to Node.js to support status 101 when initializing requests, i.e. `new Response(null, { status: 101 })`.

This is because people use `Response` in server runtimes to indicate well... a response 😅  

On the service worker front, I'm not sure how this would be useful outside of testing (but it'd be useful there).

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