[NNC] Added reductions to NNC python bindings. (#52492)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/52492
Reviewed By: bdhirsh
Differential Revision: D26575506
Pulled By: Chillee
fbshipit-source-id: 9a070f591a9709dab55dfff849184b1bcffc4fa5
