[ENH] best_on_top addition in plot_pairwise_scatter

[aryanpola]

Reference Issues/PRs

Fixes #2651

What does this implement/fix? Explain your changes.

The plot previously shows the better accuracy estimator on the y-axis (default). Added a parameter that can now show better accuracy estimator on x-axis when best_on_top=False.

Better on y-axis

Better on x-axis

Also added a test in test_plot_pairwise_scatter()

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#FBCA04}{\textsf{visualisation}}$ ]. Feel free to change these if they do not properly represent the PR.

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