Store metadata about original OSM data, and return it in the API response, if available.

unit_tests/engine/offline_facade.cpp

@@ -341,6 +341,7 @@ class ContiguousInternalMemoryDataFacade<routing_algorithms::offline::Algorithm>
     StringView GetDestinationsForID(const NameID /*id*/) const override { return StringView{}; }
     StringView GetExitsForID(const NameID /*id*/) const override { return StringView{}; }
     bool GetContinueStraightDefault() const override { return false; }
+    std::string GetTimestamp() const override { return ""; }
     double GetMapMatchingMaxSpeed() const override { return 0; }
     const char *GetWeightName() const override { return ""; }
     unsigned GetWeightPrecision() const override { return 0; }

unit_tests/mocks/mock_datafacade.hpp

@@ -10,7 +10,6 @@
 #include "extractor/turn_lane_types.hpp"
 #include "guidance/turn_bearing.hpp"
 #include "guidance/turn_instruction.hpp"
-#include "guidance/turn_instruction.hpp"
 
 #include "engine/algorithm.hpp"
 #include "engine/datafacade/algorithm_datafacade.hpp"
@@ -54,6 +53,7 @@ class MockBaseDataFacade : public engine::datafacade::BaseDataFacade
     {
         return 0;
     }
+    std::string GetTimestamp() const override { return ""; }
     NodeForwardRange GetUncompressedForwardGeometry(const EdgeID /* id */) const override
     {
         static NodeID data[] = {0, 1, 2, 3};