feat: Adopt AGP v9

[hurali97]

Description

This PR is rasied following the second phase of the RFC around AGP v9 adoption:

RFC: react-native-community/discussions-and-proposals#1006

Changes

The gist of this PR is to make RNScreens AGP v9 compliant with backward compatibility. The main scope of changes is the react-native-screens/android/build.gradle. The rest of the changes can be considered temporary.

The rest changes include:

• Making Fabric Example App AGP9 compliant
• Upgrade Gradle to v9.4.1
• Use proguard-android-optimize proguard file
• Enable opt outs in the gradle.properties

Ideally, we should not enable the opt outs and leverage the AGP 9 built-in kotlin and newDSL. However, if we do not do it, then other libraries which are not yet AGP v9 compliant starts to fail. Hence, we need to keep the opt outs enabled for a while. For the context, react-native starting from 0.87.x will ship with AGP v9 and opt outs enabled by default for the new apps, which is the first phase of AGP v9 adoption.

With the second phase when the libraries starts adoption AGP v9, we can eventually remove the opt outs from Fabric Example.

Test plan

To test this PR, we need to do a few steps:

• Set the agp version to 9.2.1 and kotlin to 2.2.0 in react-native-gradle-plugin

--- a/node_modules/@react-native/gradle-plugin/gradle/libs.versions.toml
+++ b/node_modules/@react-native/gradle-plugin/gradle/libs.versions.toml
@@ -1,10 +1,10 @@
 [versions]
-agp = "8.12.0"
+agp = "9.2.1"
 gson = "2.8.9"

-kotlin = "2.1.20"
+kotlin = "2.2.0"
 assertj = "3.25.1"

• Comment out the following functions in react-native-gradle-plugin

--- a/node_modules/@react-native/gradle-plugin/react-native-gradle-plugin/ReactPlugin.kt
+++ b/node_modules/@react-native/gradle-plugin/react-native-gradle-plugin/ReactPlugin.kt
@@ -1,10 +1,10 @@
      configureBuildTypesForApp(project)
    }

    // Library Only Configuration
-    configureBuildConfigFieldsForLibraries(project)
-    configureNamespaceForLibraries(project)
+    // configureBuildConfigFieldsForLibraries(project)
+    // configureNamespaceForLibraries(project)
    project.pluginManager.withPlugin("com.android.library") {

These step is only required because we have RN version on 0.85.2 and AGP + kotlin bump will be shipped with 0.87.x.

Verified by locally patching reanimated, safe-area, etc and making those AGP v9 compliant and removing the opt outs to test the changes in the PR

agp-v9.mp4

Verified these changes work with AGP 8

agp-v8.mov

Checklist

• Included code example that can be used to test this change.
• Ensured that CI passes