[DataPipe] Make GroupBy serializable with lambda function (#71497)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71497
Related to https://github.com/pytorch/data/issues/172
cc VitalyFedyunin ejguan NivekT
Test Plan: Imported from OSS
Reviewed By: ejguan
Differential Revision: D33668749
Pulled By: NivekT
fbshipit-source-id: 6506614e9d4389dc645d8985c00fdb3402122d9b
(cherry picked from commit 458e76fcb1a60691a225f3f5e4a058a51490732d)
