Add traversability layer name to python bindings (#77)

Author: GoldenZephyr

python/bindings/src/spark_types.cpp

@@ -61,6 +61,7 @@ void init_spark_types(py::module_& m) {
       .def_readonly_static("AGENTS", &DsgLayers::AGENTS)
       .def_readonly_static("PLACES", &DsgLayers::PLACES)
       .def_readonly_static("MESH_PLACES", &DsgLayers::MESH_PLACES)
+      .def_readonly_static("TRAVERSABILITY", &DsgLayers::TRAVERSABILITY)
       .def_readonly_static("ROOMS", &DsgLayers::ROOMS)
       .def_readonly_static("BUILDINGS", &DsgLayers::BUILDINGS)
       .def_static(