CSS SVGLinearGradient support (#8917)

## Summary
PR adds SVG LinearGradient CSS Property which enables animation of SVG
Linear Gradients.

## Test plan
You can play with prepared examples:
Run fabric-example -> CSS -> Animated Properties -> SVG Properties ->
LinearGradient



Requires: #8871

Author: wisniewskij

apps/common-app/src/apps/css/examples/animations/routes/properties/svg.ts

@@ -22,6 +22,10 @@ export const svgPropertiesRoutes = {
     name: 'Line',
     Component: svgAnimatedProperties.Line,
   },
+  LinearGradient: {
+    name: 'LinearGradient',
+    Component: svgAnimatedProperties.LinearGradient,
+  },
   Path: {
     name: 'Path',
     Component: svgAnimatedProperties.Path,