Add Shopify Fulfillment Line Item Dataset#1404

Please expand the Shopify connector to include a dedicated dataset (or extend the existing Orders dataset) that exposes data at the fulfillment line item level.
The Shopify Admin API provides this information under the fulfillments.line_items array, which links fulfillments to their corresponding order line items.

Required fields:

order_name → Orders

line_items → Fulfillments (fulfillments.line_items array, flattened to rows)

fulfillment_id → Fulfillments (fulfillment.id)

order_line_item_id → Fulfillment line item (line_item_id, links to order line item)

quantity → Fulfillment line item (quantity, fulfilled quantity)

fulfillment_created_at → Fulfillments (created_at)