Add a stateless session police management

[TheRustifyer]

Explanation

• SessionCreationPolicy.STATELESS: This ensures that no session is created or used for storing authentication details. Every request must include the necessary authentication information (e.g., a JWT).
• Security Context Repository: We’re already using a custom SecurityContextRepository. This works seamlessly with stateless configurations, as the security context will not rely on server-side sessions.

This approach ensures the application is stateless and eliminates any unnecessary session-related behavior.