Update openFileChooser to work on apps with requestLegacyExternalStorage disabled

[benlondon]

Android apps targeting Android 11 (API level 30) can no longer use the requestLegacyExternalStorage attribute. This impacts apps that want to open a file chooser with a fileUrl directed at a file within the app's own storage. Explicit permission needs to be granted to the Action View Intent through the Intent.FLAG_GRANT_READ_URI_PERMISSION flag.

This article gives a good explanation on this flag and how it should be used.

The code below would not work for an app with requestLegacyExternalStorage disabled prior to this PR.

SendIntentAndroid.openFileChooser(
      {
        fileUrl: '/storage/emulated/0/Android/data/com.example.app/files/Download/example.pdf',
        type: 'application/pdf'
      },
      'Open File with:',
    );

[lucasferreira]

Thanks @benlondon ;)