Replace dynamic distance calculation for table plugin with pre-calculated distances on shortcuts, avoiding unpacking cost.

Adds approx 10% to total data size.  Speeds up large table requests by 2 orders of magnitude.

Co-authored-by: Kajari Ghosh <ghoshkaj@gmail.com>

src/extractor/extraction_containers.cpp

@@ -387,12 +387,16 @@ void ExtractionContainers::PrepareEdges(ScriptingEnvironment &scripting_environm
             const auto weight = edge_iterator->weight_data(distance);
             const auto duration = edge_iterator->duration_data(distance);
 
+            const auto accurate_distance =
+                util::coordinate_calculation::fccApproximateDistance(source_coord, target_coord);
+
             ExtractionSegment segment(source_coord, target_coord, distance, weight, duration);
             scripting_environment.ProcessSegment(segment);
 
             auto &edge = edge_iterator->result;
             edge.weight = std::max<EdgeWeight>(1, std::round(segment.weight * weight_multiplier));
             edge.duration = std::max<EdgeWeight>(1, std::round(segment.duration * 10.));
+            edge.distance = accurate_distance;
 
             // assign new node id
             const auto node_id = mapExternalToInternalNodeID(