ArrowDataFrame and DataFrame test suites (#17)
* dask repartition
* update docs
* update
* refactor extensions
* add cotransform
* fix lint
* update
* update
* test spark
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* update
* add spark
* fix 3.8
* fix 3.8
* add spark support
* remove modin
* remove modin
* update
* improve repartition
* improve test coverage
* update file system
* arrow dataframe and test suite
* fix pandas df name
* add IO
* update version
