Part of epic: https://gitlab.com/groups/gitlab-org/-/epics/9692 ### Problem We want to expose LoC count to users, but we don't calculate it at the moment. ### Proposal * Use [`scc`](https://github.com/boyter/scc) library to calculate LoC ([see thread with more details](https://gitlab.com/groups/gitlab-org/-/epics/9692#note_1244650872)) * Extend `CommitLanguages` RPC to return LoC data