feat: add background fill functionality for layers

- Implemented FillLayerBackgroundCommand to fill the background of layers with a specified color.
- Introduced BackgroundFillManager to manage background fill operations.
- Updated LayerManager to include fillLayerBackground method.
- Enhanced LayersPanel with a color picker for filling layer backgrounds.
- Modified RasterizeLayerCommand to reflect changes in terminology and functionality.
- Adjusted LayerSort to ensure filled layers are rendered at the correct z-index.
- Updated relevant utility functions and components to support new fill feature.

src/component/Canvas/CanvasEditor/utils/layerUtils.js

@@ -1,4 +1,4 @@
-import { isArray } from "lodash-es";
+import { fill, isArray } from "lodash-es";
 
 /**
  * 图层关联工具类
@@ -193,6 +193,8 @@ export function simplifyLayers(layers) {
               .filter((obj) => obj !== null)
           : [],
       children: layer.children && isArray(layer.children) ? simplifyLayers(layer.children) : [],
+      fill: layer?.fill || null,
+      fillColor: layer.fillColor,
     };
 
     return simplifiedLayer;