Add lite SequentialSampler to torch mobile (#43299)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/43299
Test Plan: Imported from OSS
Reviewed By: iseeyuan
Differential Revision: D23228415
Pulled By: ann-ss
fbshipit-source-id: eebe54353a128783f039c7dac0e2dd765a61940d
