Cleanup dataset UT: restore config support

Merge pull request !1308 from h.farahat/string_tensor2

add support for MindRecord and TFRecord
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optimize tensorshape

optimize tensorshape and FlatIndex

TFRecord and MindRecord support for string tensor

Modify mem layout
Add new constructor
Add method Allocate

Change some GetMutableBuffer usages to AllocateBuffer

Merge pull request !1281 from Peilin/splitOp

implementation 99% complete

everything and tested except for repeatable shuffling

tested most basic/typical split usecases

cleanup

some more cleanup

fix CI

more ci fix

more ci fixes

more ci fix

more ci fix

more ci fix

added more tests, fixed some bugs

some more clean up and test cases

added shard/shuffle before split warning/error

addressed code review comments and ci

fixed ci

Merge pull request !1235 from xiefangqi/xfq_del_CRLF

-replace switch'case by indexing

- Add test case
- Add constructors
- Add getItem string

- Fix bugs
- Add more tests

- Tensor iterator
- asNumpy
- TextFileDataset

- Tensor(Numpy)

- Super > 2D
- Add more test cases for GeneratorDataset

- Change StartAddr to GetBuffer and GetMutableNuffer

- Raise an error if batch is used with strings

Clean-up work

Merge pull request !1126 from xiefangqi/voc_support_detection

clang format updates

self-review cleanups

cpplint fix

review updates

ci fixes

Merge pull request !869 from JesseKLee/random_data_op

Merge pull request !830 from Jamie/operator_print

fix some ci failures

more ci fixes

more ci fails

yet another ci fail

more ci stuff

still ci

more ci

more ci

more ci

Merge pull request !793 from yanghaitao/yht_err_msg_num_rows_zero

Merge pull request !711 from ZiruiWu/mindspore_master_only

Merge pull request !736 from yanghaitao/yht_tftextfile_black_line

fix ut

Merge pull request !406 from Peilin/first-row-crc-check

Merge pull request !404 from JunhanHu/python_sampler_for_cpp_dataset

addressed code review comments. added check in python layer to exclude directories and to raise an error if a pattern does not match any file

fixed clang format

fixed cppcheck

fixed cppcheck (used std::accumulate and std::copy_if). regenerated tfrecord file to contain correct header, it was a dummy header before

fixed cppcheck: added const reference for string parameter for lambdas, fixed clang format: whitespace adjustments

more clang whitespace fixes...

changed print to logger.info

Merge pull request !207 from ZiruiWu/batch_info_overflow

fix clang

pybind fix

Merge pull request !168 from Alexey_Shevlyakov/remove_mindspore_make_unique