Re: [whatwg/fetch] Add a speculative flag to `Request` as well as related processing (#881)

> Is prefetch sometimes/mainly/solely targeting (top) navigation loads.
It seems to be the case since we want prefetch (at least navigation cross origin prefetch) to escape cache partitioning for instance.

There are many cases where prefetch is used to load subresources. For instance, there are sites that will create a `<link rel=prefetch>` to a critical-path subresources when you click on a link in order to save a RTT. I'd really like us to solve prefetch for both x-origin documents and subresources.



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