GitLab

* [fix] unclose FD and not load/store metadata many times

* one more stat

* Update fairscale/experimental/wgit/sha1_store.py

* add name to the objects when added

* dict key can be int from a state_dict

* removed top_level_objects key; it should be added into repo, not sha1_store
Co-authored-by: Min Xu <min.xu.public@gmail.com>