Unify visualization process

[zyteka]

Right now, visualizing different explanation types requires calling completely different functions, often with totally different parameters. plot_tree, for example, take an explainer, while plot_top_contributors takes an explanation.

For this issue, we will unify feature-based explanations to use consistent input - namely, either Pyreal Explanation objects or RealApp return types. Both should be supported

[zyteka]

Reopening as this did not fix the plot_tree inconsistencies