feat: implement hotreload for scss @use at-rule

[oknozor]

This PR implements #5000.

To test the implementation:

• clone the demo app reproducer: https://github.com/oknozor/dx-hotreload-scss
• install the Dioxus CLI from this PR .
• run dx serve --package web in the demo app directory.
• modify non bundled assets/hero.scss or assets/hero-sass.sass and observe hot reloading in the app.

Please let me know if you have any feedback or if further changes are needed. This is my first PR here, so I’m happy to make any adjustments if I’ve missed something important.

[oknozor]

There was an issue with the wrong file being copied to android device when hot reloading.

Before 20ca013 the changed asset was file directly pushed to device instead of the processed one.

This resulted in copying the scss source instead of the compiled output. Breaking stylesheet whenever we use @use or @import.

The debug log below demonstrates the issue:

Before

13:39:34 [dev] Hotreloading asset "/code/dx-reproducer/assets/main.scss" in target "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets"
13:39:34 [dev] Compiling scss file: /code/dx-reproducer/assets/main.scss
13:39:34 [dev] copying processed asset from "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets/partial.main-dxh61f8fed067dbb6ac.css" to "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets/main-dxh61f8fed067dbb6ac.css"
13:39:34 [dev] Pushing asset "/code/dx-reproducer/assets/main.scss" to device: "/data/local/tmp/dx/main-dxh61f8fed067dbb6ac.css"

After:

13:40:43 [dev] Hotreloading asset "/code/dx-reproducer/assets/main.scss" in target "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets"
13:40:43 [dev] Compiling scss file: /code/dx-reproducer/assets/main.scss
13:40:43 [dev] copying processed asset from "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets/partial.main-dxh61f8fed067dbb6ac.css" to "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets/main-dxh61f8fed067dbb6ac.css"
13:40:43 [dev] Pushing asset "/code/dx-reproducer/target/dx/dx-reproducer/debug/android/app/app/src/main/assets/main-dxh61f8fed067dbb6ac.css" to device: "/data/local/tmp/dx/main-dxh61f8fed067dbb6ac.css"