Retrieves all external identifiers associated with a specific design.

Business Context:
External identifiers allow partners to maintain references between their systems
and Elios Fund designs. This enables seamless integration and tracking
across multiple platforms.

Common Use Cases:

• Track designs in your CRM system
• Maintain references to third-party design tools
• Support multi-system workflows
• Enable data synchronization between platforms
• Audit trail and relationship mapping

Response Information:

• Key-value pairs of external system identifiers
• Creation timestamps and source tracking
• Support for multiple identifier types per design