M3: DB seed, scenarios and much more...
In this MR:
- Database seed: dummy data can be added by GET request on new endpoints. DB can be cleaned also
- application.properties -> application.yaml
- Metrics for production service
- Prometheus and Grafana was added to docker-compose, prometheus.yml was added
- Spring-boot security: API Gateway now has security config (there is a bug with a scopes -> needs to be fixed).
- Auth client for token retrieval
- README.md update: test scenarios and API description update
- Small refactoring and bug fixing