refactor: move kra to crate

in the interest of reusing that code in a gallery app

src/main.rs

@@ -15,7 +15,6 @@ use iced::{
 use image::{EncodableLayout, RgbaImage, imageops};
 use size::Size;
 
-mod kra;
 mod utils;
 
 #[derive(Clone, Debug)]
@@ -302,7 +301,7 @@ impl State {
 
 fn main() -> Result<(), iced::Error> {
     jxl_oxide::integration::register_image_decoding_hook();
-    kra::register();
+    kra_image_integration::register();
 
     iced::application(State::new, State::update, State::view)
         .subscription(State::subscription)