REFACTOR: remove code duplication for `PandasOnRayDataframePartitionManager`

In the current implementation, the following methods of PandasOnRayDataframePartitionManager class (child class of PandasDataframePartitionManager) are overridden just to apply the progress_bar_wrapper decorator:

• map_partitions
• lazy_map_partitions
• map_axis_partitions
• _apply_func_to_list_of_partitions
• apply_func_to_select_indices
• apply_func_to_select_indices_along_full_axis
• apply_func_to_indices_both_axis
• binary_operation

Moving the decorator to the base class will remove the duplication of functions.

[vnlitvinov]

This doesn’t work because classmethod decorator should be applied last (#4895).

Okay, so then do just

    lazy_map_partitions = classmethod(progress_bar_wrapper(GenericRayDataframePartitionManager.lazy_map_partitions.__func__))

maybe even defining a small helper method like

class RayDataframePartitionManager:
    # do things

def _make_wrapped_method(name):
    setattr(
        RayDataframePartitionManager, 
        name,
        classmethod(
            progress_bar_wrapper(
                getattr(GenericRayDataframePartitionManager, name).__func__)
            )
        )
    )

for method in ('lazy_map_partitions', ........):
    _make_wrapped_method(method)

[anmyachev]

@anmyachev @vnlitvinov can we use inherit_doctsrings to inherit the parent class docstrings?

I think we can, but this only solves part of the issue of code duplication.