feat(io/streams): Add readerFromIterable()

[nayeemrmn]

No description provided.

[kt3k]

I think this can be implemented like in the following way:

function readerFromIterable(
  iterable: Iterable<Uint8Array> | AsyncIterable<Uint8Array>,
) {
  return readerFromStreamReader(
    readableStreamFromIterable(iterable).getReader(),
  );  
}

But this involves a lot of unnecessary overhead. I think it's nice to have this simpler version of this utility.

[kt3k]

LGTM