Add ability to set instance of StreamInterface as output stream

[artemmolotov]

Example:

use Laminas\Diactoros\Response;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\StreamInterface;
use ZipStream\Option\Archive as ArchiveOptions;
use ZipStream\ZipStream;

...

public function example(StreamInterface $outputStream): ResponseInterface
{
    $options = new ArchiveOptions();
    $options->setOutputStream($outputStream);

    $zip = new ZipStream(null, $options);
    $zip->addFile('sample.txt', 'Sample String Data');
    $zip->finish();

    return new Response($outputStream, 200, [
        'Content-Type' => 'application/zip',
        'Content-Disposition' => 'attachment;filename="archive.zip"',
        'Cache-Control' => 'max-age=0',
    ]);
}

[coveralls]

Coverage increased (+1.4%) to 75.506% when pulling 384af34 on artemmolotov:feature/output-to-psr7-stream into a1882eb on maennchen:master.

[NicolasCARPi]

LGTM