[caffe2] exposes Net cancellation through pybind state (#44043)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44043
To invoke `cancel` from the net instance in Python, we expose it through pybind state.
Reviewed By: dzhulgakov
Differential Revision: D23249660
fbshipit-source-id: 45a1e9062dca811746fcf2e5e42199da8f76bb54
