Add torch.linalg.vector_norm function (#51099)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/50214
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51099
Reviewed By: agolynski
Differential Revision: D27147360
Pulled By: mruberry
fbshipit-source-id: 1056f840e7027ad81971c9d1a9f952ab9648f1b5
