Upload with a temp file instead of streaming

Using a stream is a no-go due to a bug in libcloud: https://issues.apache.org/jira/browse/LIBCLOUD-935?focusedCommentId=16152982&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16152982

Instead, write the uploaded file to a named tempfile and pass that to
the uploader.

atst/uploader.py

@@ -1,4 +1,6 @@
+from tempfile import NamedTemporaryFile
 from uuid import uuid4
+
 from libcloud.storage.types import Provider
 from libcloud.storage.providers import get_driver
 
@@ -26,11 +28,11 @@ class Uploader:
             )
 
         object_name = uuid4().hex
-        self.container.driver._put_object(
-            stream=iter(fyle.stream),
-            container=self.container,
+        with NamedTemporaryFile() as tempfile:
+            tempfile.write(fyle.stream.read())
+            self.container.upload_object(
+                file_path=tempfile.name,
                 object_name=object_name,
-            verify_hash=False,
                 extra={"acl": "private"},
             )
         return (fyle.filename, object_name)