Development of a new solver for steady-state 2D Navier-Stokes equations

[nikoscham]

This issue has been added to the FEAScript roadmap for the upcoming 0.2.0 release (https://github.com/orgs/FEAScript/discussions/17).

Tasks

• Define weak formulation for steady-state incompressible Navier-Stokes equations in 2D
• Integrate with the Newton-Raphson nonlinear solver (#22)
• Validate solver with benchmark cases (e.g., lid-driven cavity, flow past a cylinder)