Implement of Cosserat 6Dofs Beam & Tutorial

[adagolodjo]

This pull request introduces support for Cosserat beam modeling and provides a tutorial for getting started.

Changes:

New Cosserat prefab: This prefab simplifies the creation of Cosserat beams within your scenes. Cosserat Scene Building Tutorial: A new tutorial guides you through building Cosserat scenes from scratch. 6 DOF Cosserat Beam Modeling: Enables modeling of Cosserat beams using all six degrees of freedom (local parameters including torsion, flexions X2, extension, and shear X2).

[damienmarchal]

Hi Youness,

Looks great. A the PR is rather big and contains a lot of files I will give feedback in separated part.

Here are a first batch:

• there seem to have a lot of files with weird names ("Pasted Image 2023354654654.png") it would be better to have that renamed so we can and idea on the content by reading the filename :)
• some files also sames "garbage"... there is a 'git' one at the root directory, and the .cache/jb (you probably needs to add this one in .gitignore)
• the "docs/text" directory is also not an explicit name

So I would suggest a cleaning of the directory