[whatwg/fetch] Align with post-payload HTTP terminology (#1136)

Per https://github.com/httpwg/http-core/pull/655 it seems HTTP specifications are aligning on "response body" being inclusive of transfer encodings and content being response body with those removed. Per the renaming there it looks like "payload body length" has to be "content length" now, perhaps.

(It's probably not worth renaming the Body mixin and we can definitely not rename the `body` properties, despite them also revealing content and not the response body.)

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