Allow using kwargs for colorbar in parallel_axes_plot

[btjanaka]

Description

This PR makes the colorbar usage more consistent with the other visualization methods. We now have a cbar arg which determines whether the colorbar is plotted. We also have a cbar_kwargs arg which allows configuration of the colorbar. The cbar_kwargs has sensible defaults for orientation and pad that align with the previous default values for cbar_orientation and cbar_pad.

Note that this is a breaking change because it removes cbar_orientation and cbar_pad.

TODO

• [x] Add cbar and cbar_kwargs args to parallel_axes_plot
• [x] Remove cbar_pad and cbar_orientation args
• [x] Update tests

Questions

Status

• [x] I have read the guidelines in CONTRIBUTING.md
• [x] I have formatted my code using yapf
• [x] I have tested my code by running pytest
• [x] I have linted my code with pylint
• [x] I have added a one-line description of my change to the changelog in HISTORY.md
• [x] This PR is ready to go