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* refactor SHA1_Store

- renamed the class
- added created_on field and refactored how init is done
- wrap long lines

* wrapped longer lines

* rename json file ref_count.json

* make sha1_buf_size an argument

* update gitignore

* added tmp_dir

* added new sha1_store add and tests

* update chdir

* add debug to test

* fixing unit test for 1.8
Co-authored-by: Min Xu <min.xu.public@gmail.com>

* Enabling ssd_offload training and test via tests/nn/data_parallel/test_fsdp_offload.py.
* Removed unused classes: SsdBuffer, SsdTensorHandleView, SsdParameter, SsdTensor
* Enhance test coverage of test_ssd_offloading_train_flatten_params_wrapper
* Modifications from PR #887 review comments.
* Update Changelog

authored-by: Mandeep Singh Baines <msb@fb.com>