feat: add label background

src/shape/shapeBase.ts

@@ -310,7 +310,7 @@ export const shapeBase: ShapeOptions = {
     } else {
       // 所有生效的 state 的样式
       const enableStatesStyle = clone(item.getCurrentStatesStyle());
-      
+
       // 原始样式
       const originStyle = clone(item.getOriginStyle());
 

src/types/index.ts

@@ -142,6 +142,12 @@ export type LabelStyle = Partial<{
   position: string;
   textBaseline: string;
   offset: number;
+  background?: {
+    fill?: string;
+    stroke?: string;
+    radius?: number[] | number;
+    padding?: number[] | number;
+  };
 }>;
 
 export type Easeing =