feat(GridFire): Added a number of python hooks

python hooks to make getting base composition more reliable; further, a number of small changes made to aid in my analysis in response to ref report 1

src/include/gridfire/engine/engine_graph.h

@@ -137,6 +137,18 @@ namespace gridfire::engine {
          */
         explicit GraphEngine(const reaction::ReactionSet &reactions);
 
+        void addReaction(
+            const reaction::Reaction& reaction
+        );
+
+        void addReaction(
+            const std::string& reaction_id
+        );
+
+        std::unique_ptr<scratch::StateBlob> constructStateBlob(
+            const scratch::StateBlob *blob = nullptr
+        ) const override;
+
         /**
          * @brief Calculates the right-hand side (dY/dt) and energy generation rate.
          *
@@ -204,6 +216,7 @@ namespace gridfire::engine {
             double rho
         ) const override;
 
+
         /**
          * @brief Calculates the derivatives of the energy generation rate with respect to temperature and density for a subset of reactions
          *