Image registration

[hspitzer]

Type of the feature

• [x] New function in sqduipy.im?
• [ ] New function in squidpy.gr?
• [x] New function in squidpy.pl?
• [ ] Change an existing functionality, such as default behavior?
• [ ] Other?

Description

We would like to provide basic image registration functionalities! This can be either feature-based or intensity-based affine registration of images.

possible api would be: sq.im.register(img_source, img_target) -> img_registered

• transform all image layers to fit on img_source
• save transformation as attribute in the image

plotting functions that need to be adapted:

• use saved transformation to correctly visualise obs coordinates.
• enable visualisation of multiple image layers in napari (using concatenated image object with all registered images as layers)