openAppSettings implem on Android

[somq]

I'm developing a proprietary plugin which has many BLE features and get some of the inspiration from this plugin.
I noticed openAppSettings method is not implemented on Android though it's possible
So, for the reference if you wish to implement the feature, here is the code if someone wish to prepare a PR

openAppSettings implementation:

  @PluginMethod
  fun openAppSettings(call: PluginCall) {
    val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS) // App details
    intent.data = Uri.parse("package:" + getActivity().getPackageName());
    getActivity().startActivity(intent);
  }

Cheers!

[pwespi]

Thank you very much. This has been added in #241.