LibWeb: Implement SVGFEColorMatrixElement and feColorMatrix

Author: https://github.com/shlyakpavel
Commit: 5ee1031b89
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6262
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/konradekk

Libraries/LibWeb/CMakeLists.txt

@@ -912,6 +912,7 @@ set(SOURCES
     SVG/SVGElement.cpp
     SVG/SVGEllipseElement.cpp
     SVG/SVGFEBlendElement.cpp
+    SVG/SVGFEColorMatrixElement.cpp
     SVG/SVGFECompositeElement.cpp
     SVG/SVGFEFloodElement.cpp
     SVG/SVGFEGaussianBlurElement.cpp