[feature][Communication] Make GridView return a communication future object.

This MR provides suggestions how to enable a future object for non-blocking communication. If the grid implementation does not provided this then a dummy object is returned that will print a warning if the features are to be used.

The call

gridView.communicate( ... ) 

will work in any case. However, code that now uses

auto future = gridView.communicate( ... ) 

will fail if there is not at least a dummy future returned. This MR fixes this issue in the interface class, in case the implementation still returns void.