chore: add namespace configuration for AGP compatibility

Author: ZGaopeng

test_shard/fake_test_app/android/app/build.gradle

@@ -27,6 +27,10 @@ if (flutterVersionName == null) {
 }
 
 android {
+     // Conditional for compatibility with AGP <4.2.
+    if (project.android.hasProperty("namespace")) {
+        namespace 'com.example.fake_test_app'
+    }
     compileSdkVersion flutter.compileSdkVersion
 
     compileOptions {

test_shard/integration_test_app/android/app/build.gradle

@@ -27,6 +27,10 @@ if (flutterVersionName == null) {
 }
 
 android {
+     // Conditional for compatibility with AGP <4.2.
+    if (project.android.hasProperty("namespace")) {
+        namespace 'io.agora.integration_test_app.integration_test_app'
+    }
     compileSdkVersion 34
 
     compileOptions {

test_shard/iris_tester/android/build.gradle

@@ -26,6 +26,9 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
+    if (project.android.hasProperty("namespace")) {
+        namespace 'com.example.iris_tester'
+    }
     compileSdkVersion 34
 
     compileOptions {

test_shard/rendering_test/android/app/build.gradle

@@ -27,6 +27,11 @@ if (flutterVersionName == null) {
 }
 
 android {
+     // Conditional for compatibility with AGP <4.2.
+    if (project.android.hasProperty("namespace")) {
+        namespace 'com.example.rendering_test'
+    }
+    
     compileSdkVersion flutter.compileSdkVersion
     ndkVersion flutter.ndkVersion