[feat] [v2] Scope for root filesystem

[birdlavv]

Describe the problem

There isn't a clean way to access files and directories in the root filesystem.
Example:
SD cards are mounted under the /Volumes directory in OSX and there is currently no clean way to access the mounted directories.

Describe the solution you'd like

Something like a scope for $ROOT for interacting with system-level files would be useful.

Context: https://v2.tauri.app/plugin/file-system/#scopes

Alternatives considered

Running the app with sudo permissions works, but it is difficult to package.

Additional context

No response

[amrbashir]

cc @tweidinger