fix(poly): bug fixing in block form

currently derivitive constraint is not working

src/poly/solver/public/polySolver.h

@@ -1,6 +1,7 @@
 #ifndef POLYSOLVER_H
 #define POLYSOLVER_H
 
+#include "linalg/solvers.hpp"
 #include "mfem.hpp"
 #include <memory>
 #include <utility>
@@ -53,7 +54,9 @@ private: // Private methods
     std::pair<mfem::Array<int>, mfem::Array<int>> getEssentialTrueDof();
     mfem::Array<int> findCenterElement();
     void setInitialGuess();
-    void saveAndViewSolution();
+    void saveAndViewSolution(const mfem::BlockVector& state_vector);
+    mfem::NewtonSolver setupNewtonSolver();
+    void setupOperator();
 
 
 };