[IMP] base: resize partner image with actual aspect ratio

Purpose of this commit is to finally stop adding extra padding to
website logo. Indeed not giving square logos lead to padding added
to images, leading to not so beautiful logo that makes people sad.

Before this commit
 * partner's image was resized to square 1024x1024. Extra padding was added
   if user provided rectangle image;
 * due to this website logo resized to square when rectangle logo provided;

After this commit,
 * sizes dict can be passed in image resizer of tools;
 * e.g. tools.image_resize_images(vals, sizes={'image': (512, 512),
   'image_small': (128, 128)})
 * image field in partner will resize with max width 1024 and height based
   on given image ratio (still image_medium, image_small will be default
   square images);
 * now website logo will respect actual aspect ratio

This commit is related to task ID 31994 . Future commits should probably
clean all that mess, but at least it seems we have something that works.

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