bug: getExternalStoragePublicDirectory is deprecated on Android 10

[jcesarmobile]

getExternalStoragePublicDirectory has been deprecated on Android 10 and files there are no longer accessible.

We use it in Filesystem plugin for "DOCUMENTS" directory.

So options are:

1. Remove "DOCUMENTS" for Android
2. Return an error on Android 10 devices but keep it working in older devices
3. Might be possible to read/write from/to Documents if you show the user a picker to create/select the file.

We also used it in the Camera plugin, but has been removed (#2559)

[jcesarmobile]

The decision was to not change the code.
On Android 10+ the Filesystem plugin already returned errors because it's not accesible.
It has been documented that it's not accesible on Android 10+ on #2663, so closing.

[ionitron-bot]

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