[whatwg/fetch] Get multiple headers as an aray rather than a combined value? (#506)

Hi,

I have a set-cookie-parser library and I got [a report](https://github.com/nfriedly/set-cookie-parser/issues/13#issuecomment-286227566) that it fails when parsing fetch responses that contain multiple `Set-Cookie` headers. Looking through the spec and the output, I see that it's returning a [combined value](https://fetch.spec.whatwg.org/#concept-header-value-combined) for both `headers.get()` and the now-deprecated `headers.getAll()`. 

IMHO, `getAll()` should return an array, but if it's too late for that then perhaps a new method could be added that returned an array, or alternatively an extra parameter to headers.get() to control it's output? (Or is it already possible and I'm just missing something?)

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