store and load local clim apriori data

Currently, apriori data to calculate filter components must be either parsed in workflow args or is calculated on data. Also, apriori is stored in lazy processingm, but is encrypted and therefore hard to read from outside. After this issue, it should be possible to use an experiment's apriori data in another experiment.

• Store apriori data as locally, similar to transformation properties. Maybe only store, when store_apriori=True. Apriori is always stored.
  • define location and if a single file storage or multiple files are suitable: <exp>/data/apriori
  • define storage format (.nc, .np, .csv, ...?): .pickle
  • is it required to store filter information, like filter size and number of split (to ensure integrity of apriori information): not implemented
• Load apriori data from local path
  • define parameter apriori_file=<path/file>.pickle
  • check for matching filter settings canceled