[Android] Register Brave as Android AutofillService for address autofill (#35567)

* [Android] Register Brave as Android AutofillService for address autofill

Re-enables the Android AutofillService that was removed in
https://github.com/brave/brave-core/pull/25759 due to crashes on
split-APK installs. Uses the SplitCompat pattern
(SplitCompatAutofillService base class) so the service works correctly
when installed from the Play Store.

When the user selects Brave as their autofill provider in Android Settings,
Brave can fill saved address profiles into third-party apps and save new
addresses from manually filled forms.

Resolves: https://github.com/brave/brave-browser/issues/41334

android/java/AndroidManifest.xml

@@ -180,6 +180,19 @@
     android:permission="android.permission.BIND_REMOTEVIEWS"
     android:exported="false" />
 
+<service
+    android:name="org.chromium.chrome.browser.autofill.BraveAutofillService"
+    android:label="@string/app_name"
+    android:permission="android.permission.BIND_AUTOFILL_SERVICE"
+    android:exported="true">
+    <meta-data
+        android:name="android.autofill"
+        android:resource="@xml/autofill_service_configuration" />
+    <intent-filter>
+        <action android:name="android.service.autofill.AutofillService" />
+    </intent-filter>
+</service>
+
 <service
     android:name="org.chromium.chrome.browser.vpn.wireguard.WireguardService"
     android:foregroundServiceType="dataSync"