Add support for complex valued keys for dict in TS (#51472)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51472
Test Plan: Imported from OSS
Reviewed By: ezyang
Differential Revision: D26177963
Pulled By: anjali411
fbshipit-source-id: 5841159c36b07290b1d88d4df27a0bf8c17d9df8
