Add CylinderAbsorbingBC - #445
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Templated AD/non-AD Lysmer-Kuhlemeyer absorbing IntegratedBC for elastodynamic wave problems. Per-displacement-component, parameterized by density/shear_modulus/lambda so c_p and c_s derive at the qp. The non-AD specialization carries hand-coded Jacobians verified against PETSc FD on a rotated slab; the AD specialization uses the framework's AD path. Dynamic and linear-isotropic only. Tests cover normal-incidence pwave and oblique-incidence swave slabs with an explicit reflection_ratio postprocessor (<1% reflection at well-resolved mesh and dt), a quarter-cylinder Exodiff regression, a full-annulus visualization input, and PetscJacobianTester on a rotated slab so off-diagonal Jacobian entries are exercised non-trivially. closes idaholab#444
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Templated AD/non-AD Lysmer-Kuhlemeyer absorbing IntegratedBC for elastodynamic wave problems, parameterized by density/shear_modulus/lambda so the P- and S-wave speeds derive at the qp. The non-AD specialization carries hand-coded Jacobians verified against PETSc FD on a rotated slab; regression tests cover pwave/swave incidence with an explicit
reflection_ratiopostprocessor (<1%) plus a quarter-cylinder Exodiff and a closed-annulus visualization input.closes #444