[whatwg/fetch] Convenience method to stream a response as text (Issue #1861)

foolip created an issue (whatwg/fetch#1861)

### What problem are you trying to solve?

`response.body` is a stream of `Uint8Array` but often you want to deal with text. `response.text()` decodes the response body as text and returns it, but all at once, not streaming.

### What solutions exist today?

```js
let response = await fetch('/');
let decoder = new TextDecoderStream();
response.body.pipeThrough(decoder);
```

### How would you solve it?

A `textStream()` helper that gives you a stream of decoded text chunks instead.

### Anything else?

This is mainly motivated by https://github.com/whatwg/html/issues/11669, where a `ReadableStream` will needed. If it's as easy to get a string stream as a byte stream, then we could probably make those APIs only accept strings. (My current thinking was to bake text decoding into them to reduce boilerplate, but @noamr suggested a new method instead.)

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