build(android): declare com.android.vending.BILLING permission

Required to unlock Google Play Console's one-time products UI (without it,
the IAP creation page says 'add BILLING to your APK'). Also added automatically
by the in_app_purchase plugin once wired; declaring it here lets us upload an
AAB that unlocks IAP setup before the Flutter IAP plumbing lands.

android/app/src/main/AndroidManifest.xml

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