3.13.0 add android onActivityCreate to example permission request popups

[ShiCheng-Lu]

To configure the activity for radar, so that permission requests can be used, users should call onActivityCreate with the activity and application context from MainActivity.java onCreate()

+ import io.radar.react.RNRadarModule;

public class MainActivity extends ReactActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // Set the theme to AppTheme BEFORE onCreate to support 
    // coloring the background, status bar, and navigation bar.
    // This is required for expo-splash-screen.
    setTheme(R.style.AppTheme);
    super.onCreate(null);
+    RNRadarModule.onActivityCreate(this, getApplicationContext());
  }

  ...
}

[lmeier]

@ShiCheng-Lu looks like tests are failing here