feat(LinkButton): support IsAsync function

Author: ArgoZhang

src/BootstrapBlazor/Components/Button/LinkButton.cs

@@ -120,14 +120,19 @@ private RenderFragment AddImage() => builder =>
 
     private async Task OnClickButton()
     {
-        if (OnClickWithoutRender != null)
+        if (IsAsync)
         {
-            await OnClickWithoutRender();
+            IsAsyncLoading = true;
+            IsDisabled = true;
         }
 
-        if (OnClick.HasDelegate)
+        await HandlerClick();
+
+        // 恢复按钮
+        if (IsAsync)
         {
-            await OnClick.InvokeAsync();
+            IsDisabled = IsKeepDisabled;
+            IsAsyncLoading = false;
         }
     }
 }