[QNNPACK Sparse] Create fc sparse operator (#50586)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50586
Creates sparse operator for fully connected layer.
Test Plan:
./build/local/fully-connected-sparse-test
Imported from OSS
Reviewed By: AshkanAliabadi
Differential Revision: D25925503
fbshipit-source-id: 49042158ba3bf26a716a6d68258fc7ead85ce9d8
