Re: [fetch] Add support for federated token binding to fetch (#30)

Yes, Fetch handles all requesting logic, including redirects. Redirects are handled in step 4 of https://fetch.spec.whatwg.org/#http-fetch at the moment. Headers such as cookies and `Referer` are added at the network level here: https://fetch.spec.whatwg.org/#concept-http-network-or-cache-fetch

I suspect both of these need to be modified somehow to account for `Token-Binding`. I suspect we want to update the concept of a request somehow with a flag that indicates that `Token-Binding` needs to be included in the request. (What happens if such a request results in a(nother) redirect?)

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