Re: [w3ctag/design-reviews] fetch() upload streaming (#434)

No explainer for this.

Here is brief description why we want to implement this:
- Web author will be able to upload streaming data - possibly generated by devices, media, and so on.
Some web clients want to talk to a streaming end-point directly without any intermediary translation. 
Traditionally, uploading streaming data was implemented on WebSocket but it has made client/server code messy. Fetch upload streaming makes that simpler.

Code sample:
```javascript
const stream = new ReadableStream({start: controller => {
    controller.enqueue("f");
    controller.enqueue("bar");
    controller.close();
}});

let response = await fetch("http://example.com/", {method:"POST", body: stream});
let text = await response.text();
console.log(`Server responded "${text}"`);
```


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