move GroupByFilename Dataset to DataPipe (#51709)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51709
Move GroupByFilename Dataset to DataPipe
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D26263585
Pulled By: glaringlee
fbshipit-source-id: 00e3e13b47b89117f1ccfc4cd6239940a40d071e
