plotter: EventPlot: Lazy IPython resource installation
plotter: EventPlot: Lazy IPython resource installation

Signed-off-by: Kapileshwar Singh <d373e2b6407ea84be359ce4a11e8631121819e79@arm.com>

bjackman/trappy,sinkap/trappy,JaviMerino/trappy,sinkap/trappy,ARM-software/trappy,bjackman/trappy,joelagnel/trappy,bjackman/trappy,JaviMerino/trappy,joelagnel/trappy,ARM-software/trappy,bjackman/trappy,ARM-software/trappy,joelagnel/trappy,JaviMerino/trappy,sinkap/trappy,ARM-software/trappy,joelagnel/trappy,sinkap/trappy