Replaced naming filename for FileSystemStorage

[hannal]

Hi,

The write method of FileSystemStorage creates the path directly, which I think is the same behavior as the get_name and get_path methods. How about using the get_name and get_path methods? This is because this way we can override these two methods to have more control over the file storage path.

Here's an example.

class FileSystemStorage(BaseFileSystemStorage):
    _path_factory: Optional[Callable] = None

    def __init__(self, path: Optional[Path | str] = None, path_factory: Optional[Callable] = None) -> None:
        self._path_factory = path_factory
        super().__init__(path)

    def get_path(self, name: str) -> str:
        if callable(self._path_factory):
            _path = self._path_factory()
        else:
            _path = self._path

        return str(Path(_path) / Path(name))

[aminalaee]

Thank you for the PR 👍