Update Swiss Judgment Prediction (Lower Court Insertion and Occlusion)

This PR contains the all datasets for the SwissJudgmentPrediction task (data folder) and a updated version of the dataset card.
In addition we added test sets to perform the LowerCourtInsertion and Occlusion.

Lower-Court-Insertion-Swiss-Judgment-Prediction and Occlusion-Swiss-Judgment-Prediction
extend Swiss-Judgment-Prediction by adding lower court insertion and sentence splitting with explainability label.
The annotations for the Lower-Court-Insertion-Swiss-Judgment-Prediction and Occlusion-Swiss-Judgment-Prediction were performed by legal experts.
The test sets should be used in combination with the Swiss-Judgment-Prediction training and validation sets.
The dataset was curated by Niklaus et al. (2021) and Nina Baumgartner.
Additional Information
This PR is done in agreement with Joel Niklaus.

Other additional information was added to the dataset card.