feat(poly): lagrangian constrained weak form of 3D lane-Emden

added a basic implimentation of the 3D lane emden equation using a lagrangian multiplier to constrain the value at the center of a spherical domain

src/poly/solver/public/polySolver.h

@@ -8,6 +8,7 @@
 
 #include "meshIO.h"
 #include "polyCoeff.h"
+#include "polyMFEMUtils.h"
 
 
 class PolySolver {
@@ -28,8 +29,6 @@ private:
 
     std::unique_ptr<mfem::GridFunction> u;
 
-    std::unique_ptr<mfem::Vector> oneVec;
-
     std::unique_ptr<mfem::VectorConstantCoefficient> diffusionCoeff;
     std::unique_ptr<mfem::ConstantCoefficient> nonLinearSourceCoeff;
     std::unique_ptr<polyMFEMUtils::GaussianCoefficient> gaussianCoeff;
@@ -40,6 +39,7 @@ private:
 
 public:
     PolySolver(double n, double order);
+    ~PolySolver();
     void solve();
 };