Added recording & exporting of StripHits in CSV format

Merged Tomasz Bold requested to merge tbold/athena:strips-digits-export into master

This MR is a followup of !63121 (merged) & !63137 (merged) & !63415 (merged) and completes half of the task described in: EFTRACK-63

FI @mvgonzal - in addition to adding Strips saving I have also made protection agains missing input (convenient for testing and I guess generally useful).

also @fpastore @mastrand

Merge request reports