Refactor ML components into own package

[luccalb]

          Currently the new components has been added to the following paths;

pipelines.data_quality.data_manipulation --> contains components that returns the new data frame after applying requested changes
pipelines.data_quality.monitoring --> contains components that does not manipulate the input data frame - only logs the anomalies
pipelines.machine_learning --> currently only contains the linear regression

Can you please rename the "machine_learning" package into "forecasts" and move the ARIMA Prediction class into this package next to linear regression. We will then have 2 components which can predict/forecast.

Originally posted by @TugceOzberkYener in #126 (comment)