Add standalone controller execution function via CSV import

[JulienCalbert]

We need to implement a lightweight Julia function to evaluate a controller produced by Dionysos without requiring any dependency on the Dionysos toolbox. This will allow external modules (e.g., philipedes) to use controllers generated by Dionysos in a minimal and decoupled way.

Goals:

1. Standalone function u = C(x)

• A Julia function that takes a state x and returns the control action u, as defined by a previously synthesized controller.
• This function must not depend on Dionysos.

Import controller mapping to CSV

Import the controller as a CSV file with the following format:

origin,h
1,u1
2,u2
3,u3
...

This CSV export functionality can stay inside Dionysos.

Optionally consider saving the associated SymbolicModel struct along with the controller data.