Add name propagation for at::alias, add tensor.set_names (#24105)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24105
tensor.set_names(names) is the out-of-place variant of
tensor.set_names_(names). This naming is probably confusing so I am
taking any and all suggestions.
Test Plan: - run tests [namedtensor ci]
Differential Revision: D16763388
Pulled By: zou3519
fbshipit-source-id: 4b2fb3acc0514515e7ca805dbc5c3d4a9bd96317
