Add number of LOC that were changed as properties to each commit activity

[cdboer]

Discussed in https://github.com/DLR-SC/gitlab2prov/discussions/96

^{Originally posted by akshaykagarwal May 12, 2023} Is it possible to add the number of lines that were changed(added/removed/modified) per commit activity? This way, one can better track a user's actual activity/contribution instead of just seeing how many commit activity they did. It can also be used to track if an activity was related to a minor change or a major one thus helping in impact analysis as well.

If you can give some pointers on where to look at for updating the code, I can try and update the code :)

[cdboer]

Will be implemented in the upcoming github2prov & gitlab2prov release.