Make linalg.lu_factor structured (#66934)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66934
cc jianyuh nikitaved pearu mruberry walterddr IvanYashchuk xwang233 Lezcano
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D32684856
Pulled By: mruberry
fbshipit-source-id: 1675448da9a8677c8420005ce753972234e7accc
