refactor(network): updated network and network::approx8 to use composition module

This is a very basic wrapper implimentation currently. This is sufficient to lock the interface down so that other code can target it. However, internally there is just a "convert" function. Eventually we should rework the code itself to use the composition module more directly.

src/composition/private/composition.cpp

@@ -333,7 +333,7 @@ namespace serif::composition {
         return old_number_fractions;
     }
 
-    bool Composition::finalize(bool norm) {
+    bool Composition::finalize(const bool norm) {
         bool finalized = false;
         if (m_massFracMode) {
             finalized = finalizeMassFracMode(norm);