feat: add batch operations for document list (#302)

### What problem does this PR solve?

document list needs to be batch operated


Issue link: #301

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/add-knowledge/components/knowledge-file/index.less

@@ -8,15 +8,13 @@
   display: flex;
   margin: 10px 0;
   justify-content: space-between;
-  padding: 24px 20px;
+  padding: 24px 0;
+  align-items: center;
+}
 
-  //   .search {
-  //     flex: 1;
-  //   }
-
-  //   .operate {
-  //     width: 200px;
-  //   }
+.deleteIconWrapper {
+  width: 22px;
+  text-align: center;
 }
 
 .img {