Re: [whatwg/fetch] Add unsafe-no-cors mode (PR #1533)

>     Given that, should we somewhere assert (and also document under the introduction of the new mode) that the associated [task destination](https://fetch.spec.whatwg.org/#fetch-params-task-destination) for unsafe-no-cors fetches _must be_ a parallel queue?

I think so. I'm adding the conditioned assertion into [fetch](https://fetch.spec.whatwg.org/#concept-fetch).

RE: the Origin discussion:

This is a shortcoming of this PR and I need to add a new member to request to permit forced Origin header elision. 
Generally speaking, I was operating under the assumption that the client would either be a cloned ESO or null, with the necessary other arguments specified, which is already in the spec as a possible argument.

> Do you have a plan for handling the many uses of a request's client with this "new" type of request? Should we audit them all, or take a snapshot of the Document's ESO at some point?

I am open to either solution here. I think if there is an expectation that the "client" is a snapshot of some variety, that should be clear and able to be relied upon, so I lean that direction. However, a null client should be applicable here.

Looking through the spec there are only a couple of instances where a null client raises my attention and I am curious how they are handled currently:
- https://fetch.spec.whatwg.org/#ref-for-concept-request-client%E2%91%A0%E2%91%A4
- https://fetch.spec.whatwg.org/#ref-for-concept-request-client%E2%91%A0%E2%91%A5
- https://fetch.spec.whatwg.org/#ref-for-concept-request-client%E2%91%A1%E2%91%A0

> Also (aside) it seems weird that a request's "window" is pretending to have access to the actual `Window` object when we're not fetching on the Document's main thread)

I would expect most uses to have a "window" of "no-window" but do not see a reason to exclude other values.



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