Re: [whatwg/fetch] consider exposing and allowing script to set Request priority (#436)

I think that a priority indication, both for `fetch()` and as part of markup is very much needed, and not just for scripts.

A few use-cases:
* fetch() triggered beacons (as mentioned)
* Adding `<link rel=preload>` for late-discovered non-render-blocking resources without having them contend with more critical resources
* Preventing non-critical third party content from contending with critical content

All these cases require a priority downgrade. I'm not sure if there are other cases that require an upgrade.


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