feat: add override internal copy function api

src/editor/core/event/handlers/copy.ts

@@ -3,6 +3,12 @@ import { CanvasEvent } from '../CanvasEvent'
 
 export function copy(host: CanvasEvent) {
   const draw = host.getDraw()
+  // 自定义粘贴事件
+  const { copy } = draw.getOverride()
+  if (copy) {
+    copy()
+    return
+  }
   const rangeManager = draw.getRange()
   // 光标闭合时复制整行
   const copyElementList = rangeManager.getIsCollapsed()

src/editor/core/override/Override.ts

@@ -1,3 +1,4 @@
 export class Override {
   public paste: ((evt: ClipboardEvent) => void) | undefined
+  public copy: (() => void) | undefined
 }