Additional unit test for sharded linear. (#70476)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70476
1) Support a single dimension for inputs
2) Test several error cases
Partially addresses https://github.com/pytorch/pytorch/issues/65638
ghstack-source-id: 146307607
Test Plan: waitforbuildbot
Reviewed By: fduwjj
Differential Revision: D33344357
fbshipit-source-id: 4de7a7177452951dbcce76f27441703447609e6f
(cherry picked from commit 96dfded5697e451b54f113f99b6d0da6f6af500d)
