[whatwg/fetch] Body.arrayBuffer(begin[, end]) (#554)

It would be very practical if `arrayBuffer()` method could take `begin` and `end` parameters in order to give the ability to reduce memory usage for requests whose content is "huge" but can still be useful in chunks (video and audio).

```javascript
const response = await fetch(videoUrl);
const slicedData =  await response.arrayBuffer(0, 1024);
```

R: @jakearchibald
FYI @paullewis

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