Fingpt forecastor backtesting

**Is your feature request related to a problem? Please describe.**
Backtesting using historical data and showing the performance of forecasting is key to understand the performance of predictions.

**Describe the solution you'd like**
For backtesting there are several python libraries already. Is there a way to run fingpt forecastor for several days outputting predictions only using the information up to that date to make the prediction?