perf(allocations): reduced overall allocations by 95%, increaseed jacobian applicatin by 2x

This commit uses global pre allocated work space to dramatically reduce memory usage and allocation time

libmeanfield/interface/mapping/domain_mapper.cppm

@@ -80,6 +80,7 @@ export namespace mean_field::mapping {
             mfem::Vector m_shape;
             mfem::DenseMatrix m_reference_dshape;
             mfem::DenseMatrix m_mesh_dshape;
+            mfem::DenseMatrix m_reference_field_jacobian;
             mfem::Vector m_field_value;
             mfem::DenseMatrix m_field_jacobian;