Implement Library API Service

[sublimeye]

Service: api-library-events

Implement a service responsible for internal library data storage and usage:

• init database
• provide CRUD operations as REST/gRPC/GQL or other approach
  • write library events into db (called consumer)
  • read library events from db (called by UI layer, could be called by another Client API layer if needed)
• in future, consider switching to push model + websockets (might be a different service)
• log info events and errors
• metrics to measure perf