Add from_bounding_box classmethod to structured mesh classes

[bessemoa]

Description

Implemented a factorization of the code adding from_bounding_box classmethod to structured mesh classes

Fixes #3871

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 18) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable) (@paulromano)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[paulromano]

Thanks!

[bessemoa]

Thank you for pushing those fixes. I still need to complete the three last points of the checklist.