feat: reduce aar size by removing R.class and BuildConfig.class (#5644)

see https://www.mobileit.cz/Blog/Pages/r-class.aspx

In case a plugin needs these, they can still be enabled with `generateBuildConfig` and `generateR` properties.

Co-authored-by: Igor Randjelovic <rigor789@gmail.com>

Author: farfromrefug

vendor/gradle-plugin/build.gradle

@@ -202,4 +202,26 @@ task addDependenciesFromNativeScriptPlugins {
 
         project.dependencies.add("implementation", jarFiles)
     }
-}
+}
+
+afterEvaluate {
+    def generateBuildConfig =  project.hasProperty("generateBuildConfig") ? project.generateBuildConfig : false
+    def generateR =  project.hasProperty("generateR") ? project.generateR : false
+    generateReleaseBuildConfig.enabled = generateBuildConfig
+    generateDebugBuildConfig.enabled = generateBuildConfig
+    generateReleaseResValues.enabled = generateR
+    generateDebugResValues.enabled = generateR
+}
+
+tasks.whenTaskAdded({ DefaultTask currentTask ->
+    if (currentTask.name == 'bundleRelease' || currentTask.name == 'bundleDebug') {
+        def generateBuildConfig =  project.hasProperty("generateBuildConfig") ? project.generateBuildConfig : false
+        def generateR =  project.hasProperty("generateR") ? project.generateR : false
+        if (!generateBuildConfig) {
+            currentTask.exclude '**/BuildConfig.class'
+        }
+        if (!generateR) {
+            currentTask.exclude '**/R.class', '**/R$*.class'
+        }
+    }
+})

vendor/gradle-plugin/gradle.properties

@@ -18,3 +18,6 @@ org.gradle.jvmargs=-Xmx16384M
 
 android.enableJetifier=true
 android.useAndroidX=true
+android.nonTransitiveRClass=true
+android.namespacedRClass=true
+android.enableSeparateRClassCompilation=true