Add list(string) (#20617)
Summary:
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#20617 [jit] Add list(string)**
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20617
Pulled By: driazati
Differential Revision: D15397739
fbshipit-source-id: 55a1e54f0ed2d9fd3ce44a8bb64bb4ba63181c9a
