feat(icon): findIcon function (#107)

* feat(icon): findIcon function

支持ElementPlus icon组件和 FontAwesomeIcon

* fix(menu): 支持第三方icon组件

src/plugins/element-plus/index.ts

@@ -93,9 +93,10 @@ const components = [
   ElDescriptions,
   ElDescriptionsItem,
   ElBacktop,
-  ElSwitch,
-
-  // icon
+  ElSwitch
+];
+// icon
+export const iconComponents = [
   Check,
   Menu,
   HomeFilled,
@@ -115,6 +116,7 @@ const components = [
 const plugins = [ElLoading];
 
 export function useElementPlus(app: App) {
+  components.push(...iconComponents);
   components.forEach((component: Component) => {
     app.component(component.name, component);
   });