Implement Kumaraswamy Distribution (#48285)
Summary:
This PR implements the Kumaraswamy distribution.
cc: fritzo alicanb sdaulton
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48285
Reviewed By: ejguan
Differential Revision: D25221015
Pulled By: ezyang
fbshipit-source-id: e621b25a9c75671bdfc94af145a4d9de2f07231e
