Function allow_move_file

cpp/src/arrow/filesystem/test_util.h:176–176

- Whether the filesystem allows moving a file

  virtual bool allow_read_dir_as_file() const { return false; }
  // - Whether the filesystem allows moving a file
  virtual bool allow_move_file() const { return true; }
  // - Whether the filesystem allows moving a directory
  virtual bool allow_move_dir() const { return true; }
  // - Whether the filesystem allows moving a directory "over" a non-empty destination