Add overloads for exif_transpose

[cdce8p]

Add overloads for exif_transpose to improve the return type based on the in_place argument.

Pillow/src/PIL/ImageOps.py

Lines 682 to 686 in 66f5a3f

	:param in_place: Boolean. Keyword-only argument.
	If ``True``, the original image is modified in-place, and ``None`` is returned.
	If ``False`` (default), a new :py:class:`~PIL.Image.Image` object is returned
	with the transposition applied. If there is no transposition, a copy of the
	image will be returned.

[cdce8p]

Thanks for the PR to my branch @radarhere 👍🏻 Just merged it.