perf: 优化PureTableBar组件的列设置弹出框，设置最大高度，超出可滚动 (#780)

src/components/RePureTableBar/src/bar.tsx

@@ -262,7 +262,7 @@ export default defineComponent({
                 v-slots={reference}
                 placement="bottom-start"
                 popper-style={{ padding: 0 }}
-                width="160"
+                width="200"
                 trigger="click"
               >
                 <div class={[topClass.value]}>
@@ -279,6 +279,7 @@ export default defineComponent({
                 </div>
 
                 <div class="pt-[6px] pl-[11px]">
+                  <el-scrollbar max-height="36vh">
                     <el-checkbox-group
                       v-model={checkedColumns.value}
                       onChange={value => handleCheckedColumnsChange(value)}
@@ -321,6 +322,7 @@ export default defineComponent({
                         })}
                       </el-space>
                     </el-checkbox-group>
+                  </el-scrollbar>
                 </div>
               </el-popover>
             </div>