Initial quantile operator implementation (#42755)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42755
Attempting to land quantile again after being landed here https://github.com/pytorch/pytorch/pull/39417 and reverted here https://github.com/pytorch/pytorch/pull/41616.
Test Plan: Imported from OSS
Reviewed By: mruberry
Differential Revision: D23030338
Pulled By: heitorschueroff
fbshipit-source-id: 124a86eea3aee1fdaa0aad718b04863935be26c7
