[SimpleS3] Added has(), download() and upload() (#653)

* [SimpleS3] Added has(), download() and upload()

* Added Symfony integration

* Updated partSize

* Doc updates

Author: Nyholm

src/Stream/StreamFactory.php

@@ -11,19 +11,19 @@
  */
 class StreamFactory
 {
-    public static function create($content): RequestStream
+    public static function create($content, int $preferredChunkSize = 64 * 1024): RequestStream
     {
         if (null === $content || \is_string($content)) {
             return StringStream::create($content ?? '');
         }
         if (\is_callable($content)) {
-            return CallableStream::create($content);
+            return CallableStream::create($content, $preferredChunkSize);
         }
         if (\is_iterable($content)) {
             return IterableStream::create($content);
         }
         if (\is_resource($content)) {
-            return ResourceStream::create($content);
+            return ResourceStream::create($content, $preferredChunkSize);
         }
 
         throw new InvalidArgument(sprintf('Unexpected content type "%s".', \is_object($content) ? \get_class($content) : \gettype($content)));