ENH: Added a new item delegate class to handle highlighting items

The class is currently used to highlight and unhighlight items
matched by the pqItemViewSearchWidget
This fixes issue 14572.

Change-Id: If88c665e1b0441aac456b62ee69a67662db301a2
ENH: Added test for pqItemViewSearchWidget (FindWidget)

Added custom test event player for pqItemViewSearchWidget
Moved pqHighlightItemDelegate class to pqComponents
Fixes issue 14572

Change-Id: Ic33efe28905cff173962a1d86f5fdde8efcf0779
Merge topic '14572-search-series-parameter-widget' into next

6e6c4406 ENH: Added test for pqItemViewSearchWidget (FindWidget)
b33652c7 ENH: Added a new item delegate class to handle highlighting items