[whatwg/fetch] Consider to add "resolveAtIdleTime" to RequestInit (#821)

During TPAC there was discussion about having lower priority fetches. The idea was something more complicated, but perhaps we could actually start by just hinting when fetch()'s promise should be resolved.
Idle time could work reasonable well for many cases, though perhaps there would need to be also some max timeout to ensure it gets resolved at some point.

And since XHR is very commonly used,  something similar could be added there too.

(Just recording this idea here, so that I don't forget it.)

@spanicker

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