Add QPurchaseResult to EntitlementsUpdateListener

[NickSxti]

Summary

• Extends QEntitlementsUpdateListener with a new overloaded onEntitlementsUpdated(entitlements, purchaseResult) method
• When deferred purchases complete in background (no active callback), the listener now receives QPurchaseResult with full purchase details
• Fixes the issue where consumable purchases that don't create entitlements resulted in an empty map with no transaction info (1768+ instances in API Gateway logs)

Changes

• QEntitlementsUpdateListener: Added second method with QPurchaseResult? parameter. Both methods have default implementations for mutual delegation — fully backward compatible
• QProductCenterManager: Success path (line ~1047) and fallback path (calculatePurchasePermissionsLocally) now pass QPurchaseResult to listener when no purchase callback exists
• Sample app: Updated EntitlementsFragment to demonstrate the new method with consumable purchase handling
• Tests: Added tests verifying listener receives QPurchaseResult for deferred purchases, and is NOT called when a callback exists

Backward compatibility

• Old implementations (override only old method) continue to work — new method default calls old
• New implementations (override only new method) work — old method default calls new
• @Deprecated annotation guides new adopters to the new method
• Java interop preserved — both method signatures accessible from Java

Test plan

• Verify SDK compiles: ./gradlew :sdk:assemble
• Run unit tests: ./gradlew :sdk:test
• Verify sample app compiles without changes to old listener code
• Test deferred consumable purchase flow — listener should receive non-null QPurchaseResult
• Test normal purchase flow — callback receives result, listener is NOT called

Resolves: SUP3-58

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