[grid] Select multiple rows with ctrl/cmd-click or shift-click

[caribouflex]

It would be a nice feature to handle the ctrl/cmd+click on a row for the multiple selection, instead of using the checkbox. The auto-select attribute can make this useless, but the best use case would be when the auto-select attribute is not present, to always select the row on click cell (one only selected), but allow the multiple selection with the ctrl/cmd+click cell and the checkbox selection.