Add taxLines property to ShippingLine interface (#2972)

* add `shippingLine.taxLines` to pos type.

* add changeset.

Author: fatbattk

.changeset/slimy-candles-beam.md

@@ -0,0 +1,5 @@
+---
+'@shopify/ui-extensions': patch
+---
+
+add optional `shippingLines.taxLines` property.

packages/ui-extensions/docs/surfaces/point-of-sale/staticPages/pages/versions.doc.ts

@@ -64,8 +64,9 @@ Refer to the [migration guide](/docs/api/pos-ui-extensions/migrating) for more i
 - Added optional \`currency\` property to \`Discount\` interface.
 - Added \`executedAt\` property to \`BaseTransactionComplete\` interface.
 - Added optional \`exchangeId\` and \`returnId\` property to \`ReturnTransactionData\` interface.
-- Added optional \`onBlur\` handler to \`SearchBar\` component.
 - Added required \`variantId\` property to \`ProductApi\` interface.
+- Added optional \`taxLines\` property to \`ShippingLine\` interface.
+- Added optional \`onBlur\` handler to \`SearchBar\` component.
 
   `,
     },

packages/ui-extensions/src/surfaces/point-of-sale/types/shipping-line.ts

@@ -1,9 +1,11 @@
 import type {Money} from './money';
+import type {TaxLine} from './tax-line';
 
 export interface ShippingLine {
   handle?: string;
   price: Money;
   title?: string;
+  taxLines?: TaxLine[];
 }
 
 export interface CalculatedShippingLine extends ShippingLine {