refactor: move app to monorepo

frontend/app/android/variables.gradle

@@ -0,0 +1,16 @@
+ext {
+    minSdkVersion = 22
+    compileSdkVersion = 32
+    targetSdkVersion = 32
+    androidxActivityVersion = '1.4.0'
+    androidxAppCompatVersion = '1.4.2'
+    androidxCoordinatorLayoutVersion = '1.2.0'
+    androidxCoreVersion = '1.8.0'
+    androidxFragmentVersion = '1.4.1'
+    coreSplashScreenVersion = '1.0.0-rc01'
+    androidxWebkitVersion = '1.4.0'
+    junitVersion = '4.13.2'
+    androidxJunitVersion = '1.1.3'
+    androidxEspressoCoreVersion = '3.4.0'
+    cordovaAndroidVersion = '10.1.1'
+}