[whatwg/fetch] Streaming upload (Issue #1438)

Past discussions: #425, #966, ...

Please also see: [other upload-streaming-blocking issues](https://github.com/whatwg/fetch/labels/upload-streaming-blocking).

Let's discuss whether we want to have the streaming upload feature, i.e., a way to attach a `ReadableStream` to a `Request`, on the Web.
Last time we discussed, all the browser vendors agreed that supporting full-duplex (c.f., #1254) would be very difficult, so I'd like to exclude the option from this discussion. Feel free discuss that at #1254 or another issue.

We, Chrome, have a partial implementation, but failed to show its effectiveness thourgh [a past experiment](https://github.com/whatwg/fetch/pull/425#issuecomment-1122620305).

We have two paths forward:

1. Get more support from other browser vendors and web developers, and ship this feature.
1. Give up this feature and remove the logic from the spec.

Thoughts?


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