feat: Restructure packages, add workflow run sync + webhook handler

[StefanNemeth]

Description

• Use Lombok annotation @Log4j2 to avoid boilerplate code
• Get rid of Git/Github sub-packaging, we plan to use Github only
• Re-structure packages using package by feature convention
• Use char array within NATS token config as string is deprecated
• Fix bug that didn't pass the proper auth token to nats using docker compose
• Rename RepositoryRepository to GitRepoRepository for clarity reasons
• Implement workflow run entity, handler for workflow run webhook and sync service

Solves #22

[egekocabas]

Tested and works smoothly 👍🏻

We just need to careful about the WorkflowRuns since it might be started with different kind of things such as scheduled, dispatch, etc and they might not be connected with a pull request. The conclusion field is valuable to determine if the run completed or not.