Workspace widget: Click on a version or version transition to visualize that version/transition

[DiegoVinasco]

In the SPARQL widget currently clicking on a node corresponding to a version transition or version does nothing. Ideally, this action should use iTowns (or a layer/tiles manager) to visualize either the version or the transition between versions (using the transactions in a version to color each building red, green, or yellow, showing the appropriate geometry). This could be done using a temporal provider like the temporal widget.