Authentication and authorization in a microservice architecture: Part 6 - implementing complex authorization using Oso Cloud local authorization

Oso Cloud's local authorization feature enables efficient authorization decisions in microservices by combining facts stored in Oso with a service's local database. The `listLocal()` method generates SQL WHERE clauses for bulk queries, while `authorizeLocal()` produces SQL SELECT statements for single-entity operations. This approach eliminates the need to replicate all authorization data to Oso and avoids inefficient one-by-one authorization checks. Configuration files map Polar predicates to SQL queries, allowing services to leverage local facts alongside centralized authorization policies for better performance and reduced coupling.