Add Initial Support for SAF (Storage Access Framework)

[alexcmgit]

SAF

The "new" way to manage files

• Support MethodCall APIs

APIs

• Create a new document ACTION_CREATE_DOCUMENT
• Get permission of a folder ACTION_OPEN_DOCUMENT_TREE

[alexcmgit]

I can't find anything about "Listen changes in a specific folder using the SAF API" so I'll keep only the current implemented API and move the BroadcastReceiver API's to a research issue (because I don't even know if it is possible with the current SAF API, I need to search more about it, probably I'll do it as native Android project using the Jetpack Compose instead as Flutter and Flutter plugin)