Roadmap for the SofaPython3 plugin

[hugtalbot]

Further to #393 we listed several tasks which could be addressed in the SofaPython3 plugin:

• Modularization
  • the interpreter
  • plugin sources
  • bindings
  • and core-prefabs
• Refactoring
  • copy SOFA structure into bindings structure/tree
  • factor out redundant code (PythonEnvironment)
• Evaluate other binding tools (nanobind)
• improve python exception transfer
• Cleaning
  • remove/depreciate fairly marginal functions from SofaPython3 (which ones?)
  • remove, if equivalent via pybind11, last calls to python C api methods.