Allow for (custom) KDEs in corner plots
The purpose of this MR is to add functionality to pesummary which allows for the user to plot (custom) KDEs along the leading diagonal, and custom 2D KDEs in the 2D panels.
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The purpose of this MR is to add functionality to pesummary which allows for the user to plot (custom) KDEs along the leading diagonal, and custom 2D KDEs in the 2D panels.