chore: Move SVG color to a separate SVGBrush struct #8402
                
     Merged
            
            
          
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Summary
This PR implements a separate CSS value type -
SVGBrushfor the SVG colors and removes SVG-specific code from theCSSColorimplementation.I named the new type
SVGBrush(instead ofSVGColor) asreact-native-svguses theRNSVGBrushtype to represent color-like values. I also need to add support for other brush values likecontext-fillandcontext-stroke(currently onlycurrentColoris supported). I will add support for then in a separate PR.