method to get EXIF and PIL image data

[kba]

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From https://github.com/qurator-spk/eynollah/pull/33#discussion_r618217772

Lest I forget: It would be nice to get the image along with the exif information:

exif, img_pil = self.workspace.resolve_image_exif(page.imageFilename)

since we're opening the image anyway.

Yes, but that would be a backwards-imcompatible change of the API. How about de-deprecating resolve_image_pil and adding another kwarg exif=False which controls whether the return value should become a tuple with the OcrdExif instance as secondary value?