Add scaling WTG model tool with case files

[yusik-kim]

I add one python code using openfast_toolbox.

This is to regenerate turbine by scaling with minimum inputs (rotor diameter ratio, and tower height) based on the reference turbine.
This tool would be a practical way of initiating wind turbine model preparation to the applications of

1. retrofit (old operating turbine, e.g. Vestas V90, Repower MM82) modelling
2. early stage of concept design / FEED when WTG supplier is not fixed

Workflow:

1. Copy the complete source case folder to a target folder.
2. Read the .fst file from the target folder.
3. Follow linked files via FASTInputDeck where possible.
4. Modify selected variables.
5. Write the modified files back in-place, preserving the copied folder structure.

Tested against the uploaded 5MW_Scaling case layout.

Two inputs :

1. LAMBDA: target to baseline rotor diameter ratio
2. TargetTowerHt: the target tower height in the scaled case. This is used to compute

Scaling rules:

• Mass ~ LAMBDA^3
• Mass per unit length ~ LAMBDA^2
• Inertia ~ LAMBDA^5
• Bending stiffness ~ LAMBDA^4
• Axial stiffness ~ LAMBDA^2
• Torsional stiffness ~ LAMBDA^4