[whatwg/fetch] Should destination of prefetch/prerender be set? (#1252)

Currently prefetch/prerender use the empty string as the destination, as documented at the note at https://fetch.spec.whatwg.org/#concept-request-destination.

Is there any benefit known to doing so, or would it be better for these features to set a destination?

There does seem to be an `as` attribute on `<link rel>`: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link#attr-as. So it could make sense for, e.g., `<link rel=preload as=audio>` to have destination "audio" and "initiator" prefetch.

And, e.g., `<link rel=prerender>` or the newly proposed [speculationrules](https://github.com/jeremyroman/alternate-loading-modes/blob/main/triggers.md) could result in initiator "prerender" and destination "document".

Related is the discussion at https://github.com/w3c/resource-hints/issues/74

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