Alexander Afonin

adding metric from #5

#230 Create metrics summary files

2

As in #230, added `steps/summarize.sh` step which generates csv reports in 'data/summary/{metric}.csv'. Used this structure of csv: `repository,count,sum,average,mean,min,max`

#231 enabling Java 21 syntax using antlr instead of javalang

3

In this PR i'm trying to replace javalang with antlr to support Java 21+ (ref. #231)