refactor: 移除 TableContentCell 组件

Author: ArgoZhang

src/BootstrapBlazor/Components/Table/Table.razor.cs

@@ -1424,10 +1424,7 @@ private RenderFragment RenderContentRow(TItem item) => builder =>
                 Value = value
             };
 
-            builder.OpenComponent<TableContentCell>(0);
-            builder.SetKey(context);
-            builder.AddAttribute(0, nameof(TableContentCell.ChildContent), RenderContentCell(context));
-            builder.CloseComponent();
+            builder.AddContent(0, RenderContentCell(context));
         }
     };