Expose more Classes and methods to the top level.

Author: karajan1001

src/aiooss2/__init__.py

@@ -6,4 +6,16 @@
 from oss2 import AnonymousAuth, Auth, StsAuth
 
 from .api import AioBucket, AioService
+from .http import AioSession
 from .iterators import AioBucketIterator, AioObjectIterator
+from .resumable import resumable_download, resumable_upload
+
+__all__ = [
+    "AioBucket",
+    "AioService",
+    "AioSession",
+    "AioBucketIterator",
+    "AioObjectIterator",
+    "resumable_upload",
+    "resumable_download",
+]