[Feature Request] Add registerWebView() support for WebView API for Ads

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Feature Request

Problem

Google officially requires registerWebView() to be called on each WebView instance to classify traffic as in-app (instead of web browser traffic), which affects:

• CPM (advertisers pay more for in-app traffic)
• Ad targeting via Ad Manager
• Policy compliance for WebView monetization

See official Google docs:

• https://developers.google.com/admob/android/browser/webview/api-for-ads
• https://developers.google.com/ad-manager/mobile-ads-sdk/android/browser/webview/api-for-ads

Current Situation

No maintained React Native package implements this today:

• react-native-google-ads-webview (Wix) → abandoned since 2022
• Manual native bridge → crashes on New Architecture (UIManagerModule is null in Bridgeless mode)

Expected Solution

Add a method like:

mobileAds().registerWebView(viewTag)

that handles the native bridge correctly for both Old and New Architecture, similar to how the Flutter plugin implements it: MobileAds.instance.registerWebView(controller)

See Flutter reference: https://developers.google.com/ad-manager/mobile-ads-sdk/flutter/webview

Why this belongs here

This package already wraps the Google Mobile Ads SDK on both Android and iOS. registerWebView() is a method on MobileAds (Android) and GADMobileAds.sharedInstance (iOS) — both already initialized by this package.

Platform

• Android
• iOS
• Both