implement lite parameter serializer (#41403)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/41403
Test Plan: Imported from OSS
Reviewed By: kwanmacher
Differential Revision: D22611633
Pulled By: ann-ss
fbshipit-source-id: b391e8c96234b2e69f350119a11f688e920c7817
