feat: add extrapolating (hindcasting)

[officialankan]

introduce a method to FitResultData that extrapolates backwards based on a fit and a reference well

[eriktoller]

The get_fit_timeseries() function already extrapolate the fited timeseries to the entier length of the reference series. So as long as the data is loaded to the reference well it should hindcast it too. Or did you mean something else with this feature?