[scripts] Update SofaRegressionProgram to support both JSON and CSV format

[epernod]

based on PR #88

Edit 2026-2-11:
Add possibility to read or write references either in csv or json format. Keep json as default one for the moment

Exemple of format for a MecanicalObject in Rigid template:

# format_version=1.0
# dof_per_point=7
# num_points=631
# layout=time,X0,Y1,Z1,Qx1,Qy1,Qz1,Qw1,...,Xn,Yn,Zn,QxN,QyN,QzN1,QwN
0.0,9.91329,71.9,-5.27454,0.0,-0.7071067811865476,0.0,0.7071067811865476,...
0.8,9.91329,71.9,-5.27454,0.0,-0.7071067811865476,0.0,0.7071067811865476,...
...

[hugtalbot]

The version of the RegressionProgram could be added, regarding backward compatibility. Why not keeping both (csv and json) but then we might face issues of coherency, compatibility
@bakpaul why did you want to have csv instead of json again?

[epernod]

I will change the code to keep both version for now