listDir method
Implementation
Future<List<FileInfo>> listDir(String path) async {
dio.Response<String> res =
await _client.get("/list/" + Uri.encodeFull(path));
var resp = getResponse(res);
var getFileListResponse = GetFileListResponse()
..mergeFromProto3Json(jsonDecode(resp.data));
return getFileListResponse.fileInfoList;
}