[vulkan] Add sigmoid activation functions (#57867)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/57867
Test Plan: Imported from OSS
Reviewed By: kimishpatel
Differential Revision: D28324220
Pulled By: SS-JIA
fbshipit-source-id: eae9d8ecca1c641cb7b356db66c368304bc92311
