fix(android): add buildFeatures.buildConfig on for AGP8+ compatibility (#790)

Author: mikehardy

android/build.gradle

@@ -82,6 +82,9 @@ android {
   compileSdkVersion getExtOrIntegerDefault('compileSdkVersion')
   if (shouldUseNameSpace){
     namespace = "com.reactnativepagerview"
+    buildFeatures {
+      buildConfig true
+    }
   }
   defaultConfig {
     minSdkVersion getExtOrIntegerDefault('minSdkVersion')