Implement rotate_img() in SpatialExperiment class

[keviny2]

No description provided.

[keviny2]

when using rotate_img(), should spatial_coords also be updated? bioconductor does not update the coords https://github.com/drighelli/SpatialExperiment/blob/devel/R/imgData-methods.R#L235

the issue is:

• if we update coords, not all images are necessarily rotated
• if we don't update coords, rotated images will have mismatched coordinates

@jkanche what do you think?

[jkanche]

I like to keep it simple, the user only intends to rotate the image :) So, we follow bioc's implementation. I believe this is also the same with squipy/spatialdata, rotating the image does not update coordinates.