Logical lanes: add street name

The street name is helpful when displaying the map (e.g. for navigation
purposes). The street name is added to the logical lanes, since the
street name will typically come from the underlying map, and most map
formats are more similar to logical lanes than to physical lanes.

Signed-off-by: Thomas Bleher <thomas.tb.bleher@bmw.de>

osi_logicallane.proto

@@ -582,6 +582,10 @@ message LogicalLane
     //
     repeated LaneConnection successor_lane = 15;
 
+    // Name of the street this lane belongs to.
+    //
+    optional string street_name = 16;
+
     //
     // Definition of available lane types.
     //