Kartothek

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* Add Deprecation warnings and migration helpers in order to facilitate the Kartothek version 6.0.0 migration.
* Removed warning for distinct categoricals (501)

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* Remove support for Python 3.6
* Allow ``pyarrow<7`` as a dependency.

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* Add :meth:`~kartothek.io.eager.copy_dataset` to copy and optionally rename datasets within one store or between stores (eager only)
* Add renaming option to :meth:`~kartothek.io.eager_cube.copy_cube`
* Add predicates to cube condition converter to :meth:`~kartothek.utils.predicate_converter`

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This release rolls all the changes introduced with 4.x back to 3.20.0.

As the incompatibility between 4.0 and 5.0 will be an issue for some customers, we encourage you to use the very stable
kartothek 3.20.0 and not version 4.x.

Please refer the Issue 471 for further information.

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* Pin dask to not use 2021.5.1 and 2020.6.0 (475)

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* Fix a bug in ``MetaPartition._reconstruct_index_columns`` that would raise an ``IndexError`` when loading few columns of a dataset with many primary indices.