feat: Accelerated Checkouts

[markmur]

Integration guide

<ShopifyCheckoutSheetProvider
  config={{
      ...checkoutKitConfigDefaults,
+      acceleratedCheckouts: {
+        storefrontDomain: env.STOREFRONT_DOMAIN!,
+        storefrontAccessToken: env.STOREFRONT_ACCESS_TOKEN!,
+        wallets: {
+          applePay: {
+            contactFields: [ApplePayContactField.email, ApplePayContactField.phone],
+            merchantIdentifier: env.STOREFRONT_MERCHANT_IDENTIFIER!,
+          },
+        },
        }
  }}
>
+  <AcceleratedCheckoutButtons
+       applePayLabel={ApplePayLabel.buy}
+       cartId={cartId}
+       cornerRadius={10}
+       wallets={[
+          AcceleratedCheckoutWallet.applePay,
+          AcceleratedCheckoutWallet.shopPay,
+       ]}
+   />
</ShopifyCheckoutSheetProvider>

Not included in this PR

• Tests for the bridge code - Coming in a fast follow

Manual Testing

iOS

• AcceleratedCheckoutButtons renders as expected with cartId
• AcceleratedCheckoutButtons renders as expected with variantId and quantity
• AcceleratedCheckoutButtons throws in development if variantId is empty or quantity is less than 1
• AcceleratedCheckoutButtons renders nothing when wallets={[]}
• AcceleratedCheckoutButtons do not render on iOS devices < 16
• cornerRadius renders as expected
• applePayLabel renders as expected
• All checkout event handlers fire as expected
• Consumers can integrate without the ShopifyCheckoutSheetProvider context provider

Android

Expectation: Buttons do not show on Android and occupy 0 space.

Catalog	Cart

---

PR Checklist

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines.
• I have read and agree with the Code of Conduct.
• I've updated the README.
• I have bumped the version number in the package.json file.
• I have added a Changelog entry.

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[github-actions]

Coverage Report

Lines	Statements	Branches	Functions
	90.81% (178/196)	90.47% (95/105)	85.48% (53/62)

[markmur]

Helps with the formatting of the .mm files

[markmur]

The native PayWithApplePayButtonLabel export from PassKit is a struct with static properties. It is unfortunately not an enum which can be initialized from a rawValue

[markmur]

Need this to be publicly available as a property on the kit before removing here

[markmur]

TODO: Expose reason here when available (not a blocker for this PR)

[markmur]

These configuration calls could potentially be conflated