fix(graph_engine): fixed major bug with jacobian sparsity

previousl the sparsity calculations for the jacobian matrix were completly broken. The method subgraph_sparsity was returning that all derivities were only depenednt on temperature and density. It should have been reporting that they also depended on some of the abundances. This was resolved by switching to a different structural sparsity engine (for_jac_sparsity). This bug had turned the solver into a fixed point iteration solver which failed for the stiff system we have. Now that it is resolved the solver can once again evolved over Gyr timescales.

src/include/gridfire/solver/strategies/CVODE_solver_strategy.h

@@ -257,7 +257,7 @@ namespace gridfire::solver {
          * sorted table of species with the highest error ratios; then invokes diagnostic routines to
          * inspect Jacobian stiffness and species balance.
          */
-        void log_step_diagnostics(const CVODEUserData& user_data) const;
+        void log_step_diagnostics(const CVODEUserData& user_data, bool displayJacobianStiffness) const;
     private:
         SUNContext m_sun_ctx = nullptr;   ///< SUNDIALS context (lifetime of the solver).
         void* m_cvode_mem = nullptr;      ///< CVODE memory block.