feat(optimal_control): implement Kalman filter module with Python bindings
- Add kalman_filter.rs with LinearKF, RTSSmoother, UKF implementations
- Add kalman_py_bindings.rs for Python API exposure
- Create tutorial notebook with 3 real-world examples (vehicle tracking, financial time series, multi-sensor fusion)
- All tests passing with excellent results (63-88% RMSE improvements)
- Fix compilation errors in py_bindings.rs (type annotations, imports)
- Successfully builds with maturin develop --release
Melvin Alvarez
1e88ba5bb6