feat: Implement Apple Sign-In for Android by adding a callback function, updating redirect URI, and configuring the Android manifest.

android/app/src/main/AndroidManifest.xml

@@ -40,6 +40,20 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+        
+        <!-- Apple Sign In Callback Activity -->
+        <activity
+            android:name="com.aboutyou.dart_packages.sign_in_with_apple.SignInWithAppleCallback"
+            android:exported="true"
+            android:launchMode="singleTop">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="signinwithapple" />
+                <data android:path="/" />
+            </intent-filter>
+        </activity>
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data