z/OS authorization checks

[plavjanik]

As a developer of the REST API, I would like to protect REST API endpoints or parts of my code by SAF resources.

• API to do authorization checks
• Check that the application has required permissions for authentication at startup
• Authorization implementation using the Java SAF APIs (DATASET resource class is not in the scope of this story)
• Integration with Spring Security
  • See https://www.baeldung.com/spring-security-create-new-custom-security-expression - 5. A New Security Expression - implement new methods hasSafResourceAccess (absolute class resource name) and hasSafServiceResourceAccess (relative to the user-configurable resource class and resource name prefix for the service)