Build: Move package from android manifest to build files

This is an AGP version '8.0' breaking change that requires 'namespace'
in module-level build scripts, see build failure below:

------------------------------------------------------------------------

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> Could not create an instance of type
 com.android.build.api.variant.impl.ApplicationVariantImpl.
   > Namespace not specified. Please specify a namespace in the module's
    build.gradle file like so:

     android {
         namespace 'com.example.namespace'
     }

     If the package attribute is specified in the source
      AndroidManifest.xml, it can be migrated automatically to the
      namespace value in the build.gradle file using the AGP Upgrade
      Assistant; please refer to https://developer.android.com/studio/
      build/agp-upgrade-assistant for more information.

------------------------------------------------------------------------

Explanation: "You must set the namespace in the module-level
'build.gradle.kts' file, rather than the manifest file."

For more info see: https://developer.android.com/build/releases/
gradle-plugin#namespace-dsl

Author: ParaskP7

app/build.gradle

@@ -4,6 +4,8 @@ plugins {
 }
 
 android {
+    namespace "org.wordpress.aztec.demo"
+
     compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {

app/src/main/AndroidManifest.xml

@@ -1,6 +1,5 @@
-<manifest
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.wordpress.aztec.demo">
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <!-- Required for downloading images -->
     <uses-permission android:name="android.permission.INTERNET" />

aztec/build.gradle

@@ -5,6 +5,8 @@ plugins {
 }
 
 android {
+    namespace "org.wordpress.aztec"
+
     compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {

aztec/src/main/AndroidManifest.xml

@@ -5,6 +5,8 @@ plugins {
 }
 
 android {
+    namespace "org.wordpress.aztec.glideloader"
+
     compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {

glide-loader/build.gradle

@@ -1,6 +1,5 @@
-<manifest
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.wordpress.aztec.glideloader">
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
         android:allowBackup="true"

glide-loader/src/main/AndroidManifest.xml

@@ -5,6 +5,8 @@ plugins {
 }
 
 android {
+    namespace "org.wordpress.aztec.placeholders"
+
     compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {

media-placeholders/build.gradle

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.wordpress.aztec.placeholders">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
         android:allowBackup="true"

media-placeholders/src/main/AndroidManifest.xml

@@ -5,6 +5,8 @@ plugins {
 }
 
 android {
+    namespace "org.wordpress.aztec.picassoloader"
+
     compileSdkVersion rootProject.compileSdkVersion
 
     defaultConfig {

picasso-loader/build.gradle

@@ -1,6 +1,5 @@
-<manifest
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.wordpress.aztec.picassoloader">
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
         android:allowBackup="true"