feat(support): continued migration to new field dof support system

mass normaliztion, gravity, displacement, and hydrostatic equilibrium are now migrated

libmeanfield/interface/operators/prepared_rotation_displacement_force.cppm

@@ -111,6 +111,9 @@ export namespace mean_field::operators {
 
         std::optional<physics::RigidRotation> m_rotation;
         mfem::Vector m_cachedResidual;
+        mutable mfem::Vector m_densityVariationTrue;
+        mutable mfem::Vector m_displacementVariationTrue;
+        mutable mfem::Vector m_actionTrue;
 
         context::rotational_displacement_force::RotationalDisplacementForceDependencies m_preparedDependencies;