ListView vs. Flowless

Tested with JDK 16.

ListViewBenchmark:

Number of LISTVIEW cell creations/layouts when:
 - updating an item in the viewport: 1/1
 - updating an item outside the viewport: 0/0
 - deleting an item in the middle of the viewport: 13/13
 - adding an item in the middle of the viewport: 13/13
 - scrolling 5 items down: 5/5
 - scrolling 50 items down: 25/25

FlowlessBenchmark:

Number of VIRTUALFLOW cell creations/layouts when:
 - updating an item in the viewport: 1/1
 - updating an item outside the viewport: 0/0
 - deleting an item in the middle of the viewport: 1/1
 - adding an item in the middle of the viewport: 1/1
 - scrolling 5 items down: 5/5
 - scrolling 50 items down: 25/25