Add missing addParcelToDelivery order update action

[Copilot]

This PR implements the missing addParcelToDelivery order update action in the commercetools mock library.

Changes Made

Implementation

• Added OrderAddParcelToDeliveryAction import and Parcel type to order actions
• Implemented addParcelToDelivery method in OrderUpdateHandler class
• Added support for all optional parcel properties:
  • parcelKey - User-defined unique identifier
  • measurements - Parcel dimensions and weight
  • trackingData - Shipment tracking information
  • items - Line items or custom line items in the parcel
  • custom - Custom fields for the parcel

Features

• Supports identification of target delivery by either deliveryId or deliveryKey
• Proper validation with clear error messages for invalid inputs
• Generates proper parcel objects with base resource properties (id, version, createdAt, etc.)
• Integrates with existing custom fields handling via createCustomFields helper

Testing

• Added comprehensive test cases covering successful scenarios with both deliveryId and deliveryKey
• Tests all parcel properties (measurements, tracking data, items)
• Includes error handling tests for missing delivery identifiers and non-existent deliveries
• All existing tests continue to pass, ensuring no regressions

Example Usage

// Add a parcel to a delivery by ID
{
  action: "addParcelToDelivery",
  deliveryId: "delivery-123",
  parcelKey: "parcel-001",
  measurements: {
    heightInMillimeter: 100,
    lengthInMillimeter: 200,
    widthInMillimeter: 150,
    weightInGram: 500
  },
  trackingData: {
    trackingId: "TRACK123",
    carrier: "DHL"
  },
  items: [
    {
      id: "line-item-1",
      quantity: 1
    }
  ]
}

Fixes #284.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 08ad0e7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@labdigital/commercetools-mock	Patch

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[mvantellingen]

@copilot the server should not return a 500 error when a parcel is not found, use CommercetoolsError to properly return a 4xx error. If you dont know, just use invalidinput for now.

[Copilot]

@copilot the server should not return a 500 error when a parcel is not found, use CommercetoolsError to properly return a 4xx error. If you dont know, just use invalidinput for now.

Fixed the error handling to use CommercetoolsError with InvalidInput code instead of regular Error. Now returns proper 4xx status codes (400) instead of 500. Commit: 2e4f9d7