[OptApp] Mass Response with shape sens with FD

[Igarizza]

📝 Description
Extending the mass response to work with any elements, using finite diference.

[sunethwarna]

nice :)

[RezaNajian]

For mass sensitivities of any geometry and element type, you can utilize nodal areas and normals without the need for further Finite Differences (FD). Thus, the nodal mass sensitivity corresponds to the nodal vector, with its magnitude determined by the nodal area. This principle is applicable to any geometry and element type. Note: Tangent sensitivities are considered to be zero, as they do not contribute and are essentially regarded as discretization errors.