Dev flow.utils.data part1 (#5406)

* refine and add test case

* support ellipsis type slice

* refine

* refine

* support slice assign ellipsis type

* refine

* register fn to localtensor

* basic implemetation of dataloader

* format

* refine as comments

* fix comments

* remove useless code

* add test case into unnitest

* refine ascomments

* refine as comments

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