[whatwg/fetch] Consider supporting Fetch Metadata. (#885)

https://mikewest.github.io/sec-metadata/ is starting to look pretty reasonable. I plan to put up some PRs to sketch out what the integration would look like, based on the thoughts in https://mikewest.github.io/sec-metadata/#fetch-integration. I think we'd need ~2 changes, but who knows? :)

1.  Add a boolean `user activation` flag to `request` objects, defaulting to `false`. We'd set it in HTML's navigation algorithm, based on whether the navigation was triggered by user activation.

2.  Call [set the Fetch Metadata headers for a request](https://mikewest.github.io/sec-metadata/#abstract-opdef-set-the-fetch-metadata-headers-for-a-request). Probably from "HTTP fetch"?

WDYT?

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