ObjectStorage refactor to take io.Reader instead of []byte

pkgs/storage/storage.go

@@ -1,9 +1,11 @@
 package storage
 
+import "io"
+
 type ObjectStorage interface {
 	List(path string) ([]ObjectDescription, error)
-	Get(path string) ([]byte, error)
-	Put(path string, object []byte) error
+	Get(path string) (io.Reader, error)
+	Put(path string, object io.Reader) error
 }
 
 type ObjectDescription struct {