Add plot script for e/pi separation performance

• update the json output from epcut and ML so rejection power and uncertainties can be directly read from them
• add a json output for run_benchmark.py to collect all run information
• add a script reading the run info files and plot the e/pi separation power curve

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• 41825bf0 - add a run_type for run_benchmark.py

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• 7cec8449 - follow up: update comments accordingly

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• 6d3955ea - add a script to visualize imaging hits (not finished)

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• 47cf99a4 - follow up: update drawing script

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• b54cfc4e - follow up: data binning for drawing 3D events

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