Readable stream async generator

Added in v10 and no longer experimental since v11.14.0, readable streams expose an async generator API:

import * as fs from 'fs';
import * as path from 'path';

(async () => {
  const stream = fs.createReadStream(path.join(process.cwd(), 'README.md'));

  for await (const chunk of stream) {
    console.log(chunk.slice(0, 5));
    // <Buffer 23 20 54 49 4c>
  }
})();

This makes working with chunks asynchronously easier, because the next chunk won't be pulled from the generator until the current iteration is complete.

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