[SIApp] Adding Strain Sensor test for solids

[sunethwarna]

📝 Description
This PR fixes the followings:

1. The strain sensor only supported geometries which returns (3x3) strain tensors, now it is extended to support strains with (2x2) size for 2d solid geometries.
2. A test for 2D solid geometries is added.
3. Implement CalculateOnIntegrationPoint methods in adjoint elements
4. Extends the strain sensor support for mixed element model parts (such as solids, beams, trusses, shells).

🆕 Changelog

• Extended strain sensors to support 2x2 strains.
• Added 3D solid test with strain sensors.

[Igarizza]

Nice work. The model is fixed and running. Thank you!