gradle: migrate to namespace attribute

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

tunnel/build.gradle

@@ -12,6 +12,7 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+    namespace 'com.wireguard.android.tunnel'
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 31

tunnel/src/main/AndroidManifest.xml

@@ -3,8 +3,7 @@
   ~ SPDX-License-Identifier: Apache-2.0
   -->
 
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.wireguard.android.tunnel">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application>
         <service

ui/build.gradle

@@ -18,6 +18,7 @@ android {
         dataBinding = true
         viewBinding = true
     }
+    namespace = 'com.wireguard.android'
     defaultConfig {
         applicationId 'com.wireguard.android'
         minSdkVersion 21

ui/src/main/AndroidManifest.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    package="com.wireguard.android"
     android:installLocation="internalOnly">
 
     <uses-permission android:name="android.permission.CAMERA" />