Add basic facades for Customizer and Partitioner run methods

src/osrm/customizer.cpp

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+#include "osrm/customizer.hpp"
+#include "customizer/customizer.hpp"
+#include "osrm/customizer_config.hpp"
+
+namespace osrm
+{
+
+// Pimpl-like facade
+
+void customize(const CustomizationConfig &config) { customizer::Customizer().Run(config); }
+
+} // ns osrm

src/osrm/partitioner.cpp

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+#include "osrm/partitioner.hpp"
+#include "partitioner/partitioner.hpp"
+#include "osrm/partitioner_config.hpp"
+
+namespace osrm
+{
+
+// Pimpl-like facade
+
+void partition(const PartitionerConfig &config) { partitioner::Partitioner().Run(config); }
+
+} // ns osrm