perf(jacobian-action): major updates to jacobian action application by removing redudant quadrature work. ~5x increase in speed

libmeanfield/interface/physics/gravity.cppm

@@ -6,6 +6,12 @@ export module mean_field:physics.gravity;
 export import :fem;
 
 export namespace mean_field::physics {
+    struct GravitySolveOptions final {
+        double relativeTolerance{1.0e-12};
+        double absoluteTolerance{1.0e-15};
+        int maximumIterations{1000};
+    };
+
     struct GravitySolution {
         mfem::ParGridFunction gradPhi;
         mfem::ParGridFunction phi;
@@ -16,6 +22,13 @@ export namespace mean_field::physics {
         }
     };
 
+    GravitySolution solve_gravity_field(
+        fem::FEM &f,
+        const GravitySolveOptions &options,
+        const mfem::GridFunction &rho,
+        const mfem::GridFunction &displacement
+    );
+
     GravitySolution solve_gravity_field(
         fem::FEM &f,
         const utils::Args &args,