remove tuple_parser (#30659)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30659
I could only find one usage of TupleParser and it doesn't seem worth maintaining just for that one usage.
Test Plan: Imported from OSS
Differential Revision: D18795979
Pulled By: nairbv
fbshipit-source-id: 6e50d65fc8fade0944f36ab20d00f1539a3d4cb8
