Checkmk Werk 10767: Implement Forecast Graph prediction engine

ID: 10767 Title: Implement Forecast Graph prediction engine Component: metrics Level: 1 Class: New feature Version: 1.7.0i1 To avoid the need for extenal dependencies for the Forecasting Graphs we have reimplemented the prediction algorithm within Checkmk. This Werk replaces Werk #7451. The {bin/install_fbprophet} script can be used to uninstall previously installed dependencies.