Integrate masked sparse Adagrad (#31641)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31641
Assuming mask is provided as a tensor
Test Plan: unit test
Reviewed By: ellie-wen
Differential Revision: D18928737
fbshipit-source-id: a4f3dd51769c2b56e5890043e91c18e6128be082
