Derive Clone for ImageLoaderSettings and ImageFormatSetting (#18335)

# Objective

I was setting up an asset loader that passes settings through to
`ImageLoader`, and i have to clone the settings to achieve this.

## Solution

Derive `Clone` for `ImageLoaderSettings` and `ImageFormatSetting`.

## Testing

Full CI passed.

crates/bevy_image/src/image_loader.rs

@@ -81,7 +81,7 @@ impl ImageLoader {
     }
 }
 
-#[derive(Serialize, Deserialize, Default, Debug)]
+#[derive(Serialize, Deserialize, Default, Debug, Clone)]
 pub enum ImageFormatSetting {
     #[default]
     FromExtension,
@@ -89,7 +89,7 @@ pub enum ImageFormatSetting {
     Guess,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug, Clone)]
 pub struct ImageLoaderSettings {
     pub format: ImageFormatSetting,
     pub is_srgb: bool,