Support cloning CSR tensors (#70581)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70581
cc nikitaved pearu cpuhrsch
Test Plan: Imported from OSS
Reviewed By: jbschlosser
Differential Revision: D33413992
Pulled By: cpuhrsch
fbshipit-source-id: 3a576d2c2f26d1edcc8f6932b2dbe2c7c11e9593