API to get dispute line items information for a specific dispute.
This endpoint retrieves detailed line item information associated with a dispute,
including item details, quantities, prices, and other relevant dispute-specific data.

The response includes:

• Individual line items associated with the dispute
• Item quantities and pricing information
• Dispute-specific item metadata

For validation errors, a 400 Bad Request response is returned.
For processing errors, a 422 Unprocessable Entity response is returned.
For unexpected errors, a 500 Internal Server Error response is returned.