Decprecating routed decoder (#70990)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70990
Releasing `decode` API for domains to let them implement custom `decode` DataPipe for now.
Test Plan: Imported from OSS
Reviewed By: NivekT
Differential Revision: D33477620
Pulled By: ejguan
fbshipit-source-id: d3c30ba55c327f4849d56f42d328a932a31777ed
