getDirectories method
Gets a list of available storage directories on the device.
Returns a List of Maps where each Map contains directory metadata (typically including 'name', 'path', and other platform-specific fields).
Example:
final directories = await MediaManagerPlatform.instance.getDirectories();
Implementation
Future<List<Map<String, dynamic>>> getDirectories() {
throw UnimplementedError('getDirectories() has not been implemented.');
}