Add "load geometry from yaml" functionality

[jellepoland]

• Start from Create a 'load_geometry_from_yaml` function for VortexStepMethod.jl, and run on a simple straight wing VortexStepMethod.jl#184
• Compute bridle line drag

Jelle:
How are tether & bridle line drag calculated?
Inside KiteModels.jl? Or inside VortexStepMethod.jl? or somewhere else?

Bart:
Part of the kite model: https://github.com/OpenSourceAWE/SymbolicAWEModels.jl/blob/main/src/generate_system.jl#L582

Bart:
each segment has drag, and each point mass gets half of the drag of each connected segment

[jellepoland]

• Use logic from Python to read struc_geometry.yaml
• Once processed, use defined Constructors to create a SysStruc of the pyramid model
• Plot this in 3D
• Once plotted, improve process_struc_geometry_yaml to also work with V3 file