Resolve "In microsoft_graph_service, move service code to an "app" folder to be consistent with the other services"
- Config is retrieved from .env in microsoft_graph_service
- .env.example is included in commit
- Code in microsoft_graph_service has been moved to the subdirectory "app"
- Imports in microsoft_graph_service are now absolute
- With the correct secrets (azure, ldap) code should now run locally.