LibWeb/CSS: Implement the color-scheme CSS property

Author: https://github.com/Gingeh
Commit: ce5cd012b9
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3146
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/CMakeLists.txt

@@ -126,6 +126,7 @@ set(SOURCES
     CSS/StyleValues/BasicShapeStyleValue.cpp
     CSS/StyleValues/BorderRadiusStyleValue.cpp
     CSS/StyleValues/CalculatedStyleValue.cpp
+    CSS/StyleValues/ColorSchemeStyleValue.cpp
     CSS/StyleValues/ConicGradientStyleValue.cpp
     CSS/StyleValues/ContentStyleValue.cpp
     CSS/StyleValues/CounterDefinitionsStyleValue.cpp