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* add support for pandas categorical columns

* remove commented code

* quotes

* syntax error

* fix shape for ranker test

* Apply suggestions from code review
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>

* Update tests/python_package_test/test_dask.py

* trying

* fix tests

* remove unnecessary debugging stuff

* skip accuracy checks on categorical

* use category columns as categorical features
Co-authored-by: Nikita Titov <nekit94-08@mail.ru>