[fx2trt][code quality] Add type annotation and docstring to utils functions in acc_ops_converters.py (#66496)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66496
As the title. No changes on the code logic.
Test Plan: CI
Reviewed By: wushirong
Differential Revision: D31576303
fbshipit-source-id: f2132309023b3c9e09810e32af91eb42eefd3f32
