Add Title Parameter with Default Value for `component_plot()`

[AuroreAA]

Currently, the scatter plots matrix of the components do not have a title parameter, which makes it difficult to quickly identify the scatter pair used. To improve the usability and clarity of the visualizations, I propose adding a title parameter to the scatter plot function.

Proposed Changes:

• Add a title Parameter to component_plot(): this parameter should accept a string value that will be displayed as the title of the scatter plot.
• Set a Default Title: S1_labels-S2labels

[aalfons]

I implemented a default title using the scatter combination as suggested in the dev branch of ICSclust. But I didn't add an argument for the title. Users can always override the default title by adding labs() or ggtitle() to the plot, which would be the ggplot2 way of modifying the title, e.g.,

component_plot(out_ICS, clusters = iris$Species) + labs(title = NULL)

to get rid of a title altogether.

[aalfons]

Other suggestion: Should we make component_plot() a generic function with methods for "data.frame", "ICS" (where supplying clusters could be optional), and "ICSClust" (with clusters automatically taken from the object).