[WIP] Added foreach_trunc, foreahc_reciprocal, foreach_sigmoid APIs (#47385)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47385
Test Plan: Imported from OSS
Reviewed By: ngimel
Differential Revision: D24737051
Pulled By: izdeby
fbshipit-source-id: ed259d9184b2b784d8cc1983a8b85cc6cbf930ba
