Add custom PurchaseLogic support to presentPaywall/presentPaywallIfNeeded APIs

[rickvdl]

Summary

• Extends the imperative presentPaywall() and presentPaywallIfNeeded() modal APIs to accept an optional purchaseLogic parameter, enabling custom purchase/restore handling
• Adds native bridge support on both iOS and Android to create HybridPurchaseLogicBridge and communicate purchase/restore events back to JS via NativeEventEmitter
• Adds example usage in the purchase tester app matching the Capacitor example pattern

Based on #1607 which added PurchaseLogic support to the PaywallView component.

Test plan

• Tested presentPaywall() with purchaseLogic on Android (calling real Purchases.purchasePackage)
• Test presentPaywall() with purchaseLogic on iOS
• Test presentPaywallIfNeeded() with purchaseLogic on both platforms
• Test presentPaywall() without purchaseLogic still works (no regression)
• Test cancellation and error flows

🤖 Generated with Claude Code

[tonidero]

I think this makes sense! Thank you!!

[tonidero]

Could be good to mention that this is a "CustomPurchaseLogic"? Like

Suggested change

	console.log('[PurchaseLogic] performPurchase', packageToPurchase.identifier);
	console.log('[CustomPurchaseLogic] performPurchase', packageToPurchase.identifier);

If we do this, we should also change it for the restore below :)