Options to colorize black&white images

- Find an API or a good local model to colorize BW images 
- Detect if an image is black and white (also should work if image's color balance is off, not only gray pixels)
- Add a button to an ImageDetails screen. It should colorize the image and show a colorized version instead
- Probably should add some Metal cool shader to this transformation
- Colored image should be able to be saved