Implement HarmonicMechanicalSimulation results

[PProfizi]

Implement result extraction APIs for HarmonicMechanicalSimulation.

HarmonicMechanicalSimulation methods

(checked: tested, italic: implemented)

• [x] displacement
• [x] velocity
• [x] acceleration
• [ ] stress, stress_elemental, stress_nodal
• [ ] stress_principal, stress_principal_nodal, stress_principalelemental
• [ ] stress_eqv_von_mises, stress_eqv_von_mises_elemental, stress_eqv_von_mises_nodal
• [ ] elastic_strain, elastic_strain_nodal, elastic_strain_elemental
• [ ] elastic_strain_principal, elastic_strain_principal_nodal, elastic_strain_principal_elemental
• [ ] elastic_strain_energy_density
• [ ] plastic_state_variable -> NA in Mechanical
• [ ] plastic_strain, plastic_strain_nodal, plastic_strain_elemental -> NA in Mechanical
• [ ] plastic_strain_principal, plastic_strain_principal_nodal, plastic_strain_principal_elemental -> NA in Mechanical
• [ ] plastic_strain_eqv, plastic_strain_eqv_elemental, plastic_strain_eqv_nodal -> NA in Mechanical
• [ ] plastic_strain_energy_density -> NA in Mechanical
• [ ] reaction_force
• [ ] element_nodal_forces, element_nodal_forces_nodal, element_nodal_forces_elemental
• [ ] nodal_force
• [ ] nodal_moment
• [ ] thickness
• [ ] element_centroids
• [ ] element_orientations
• [ ] elemental_mass
• [ ] elemental_volume
• [ ] hydrostatic pressure