Deduplicate foward/reverse geometries

Changes the internal representation of compressed geometries to be a
single array shared between forward and reverse geometries that can be
read in either direction. Includes a change on
extractor::OriginalEdgeData to store via_geometry ids that indicate
which direction to read the geometry for that edge based edge.

Closes #2592

unit_tests/util/static_rtree.cpp

@@ -166,8 +166,7 @@ struct GraphFixture
             d.forward_segment_id = {pair.second, true};
             d.reverse_segment_id = {pair.first, true};
             d.fwd_segment_position = 0;
-            d.forward_packed_geometry_id = 0;
-            d.reverse_packed_geometry_id = 0;
+            d.packed_geometry_id = 0;
             edges.emplace_back(d);
         }
     }