[quant][pyper] Rename the sparse argument for embedding_bag ops (#46003)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46003
sparse is confusing because itt is used in training for sparse gradients
Test Plan: Imported from OSS
Reviewed By: radkris-git, qizzzh
Differential Revision: D24178248
fbshipit-source-id: 0a2b595f3873d33b2ce25839b6eee31d2bfd3b0d
