Searches for fraud cases asynchronously.

• The method receives the fraud case search request, which includes search criteria encapsulated in the FraudCaseDetailsSearch model.
  It logs the request details for auditing and troubleshooting purposes.
• On success, an HTTP 200 (OK) response is returned.
• For business logic failures, an appropriate status code and error message are returned.
• For unhandled exceptions, an HTTP 500 (Internal Server Error) is returned with a generic error message.