Re: [whatwg/streams] ReadableStream.from(X) (#1018)

The main motivating example is this from the [CompressionStream explainer](https://github.com/ricea/compressstream-explainer/blob/master/README.md#example-code):

```javascript
async function compressArrayBuffer(in) {
  const cs = new CompressionStream('deflate');
  const writer = cs.writable.getWriter();
  writer.write(in);
  writer.close();
  const out = [];
  const reader = cs.readable.getReader();
  let totalSize = 0;
  while (true) {
    const { value, done } = await reader.read();
    if (done)
      break;
    out.push(value);
    totalSize += value.byteLength;
  }
  const concatenated = new Uint8Array(totalSize);
  let offset = 0;
  for (const array of out) {
    concatenated.set(array, offset);
    offset += array.byteLength;
  }
  return concatenated;
}
```
where it took 3 lines just to create a stream containing a single ArrayBuffer chunk, something that feels like it should be a one-liner. This is also a possible solution to https://github.com/whatwg/fetch/issues/809.

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