plot_with_zoom with optional y parameter

[LouisCarpentier42]

Currently, the plot_with_zoom function in the visualization module requires a value for y (the anomaly scores). However, in some situations, it might be useful to zoom in on a time series without having any labels (in an explorative analysis for example). In this case, you can set the y parameter to 0 values by default, but a better solution would be to allow for an optional value for this parameter. I think the most challenging part of this feature would be to properly handle the method_to_plot parameter, because the y value is passed to this method. Should we still call this function, or should we 'simply' plot the data using something like plt.plot(X)?