Rename side API

Side -> Approach
 - DEFAULT -> CURB
 - BOTH -> UNRESTRICTED
 - remove OPPOSITE param

Signed-off-by: FILLAU Jean-Maxime <jean-maxime.fillau@mapotempo.com>

unit_tests/mocks/mock_datafacade.hpp

@@ -147,7 +147,7 @@ class MockBaseDataFacade : public engine::datafacade::BaseDataFacade
 
     std::pair<engine::PhantomNode, engine::PhantomNode>
     NearestPhantomNodeWithAlternativeFromBigComponent(const util::Coordinate /*input_coordinate*/,
-                                                      const engine::Side /*side*/) const override
+                                                      const engine::Approach /*approach*/) const override
     {
         return {};
     }