👑 [需求] Table 底部分页栏可以添加slot

### 🥰 需求描述

如图想要在底部分页栏添加按钮，合理利用空间


No file or test is named. Start by locating the Table component's bottom pagination implementation and reviewing how its existing customization APIs are exposed. Done means the bottom pagination area can accept a documented slot that renders an additional button or other content alongside the pagination controls.

Written by the indexing model from the issue text.