feat: add PubMed operator #918 (#1589)

### What problem does this PR solve?

feat: modify the translation of baiduDescription #918
feat: add PubMed operator #918
### Type of change


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

web/src/pages/flow/pubmed-form/index.tsx

@@ -0,0 +1,31 @@
+import TopNItem from '@/components/top-n-item';
+import { useTranslate } from '@/hooks/common-hooks';
+import { Form, Input } from 'antd';
+import { IOperatorForm } from '../interface';
+
+const PubMedForm = ({ onValuesChange, form }: IOperatorForm) => {
+  const { t } = useTranslate('flow');
+
+  return (
+    <Form
+      name="basic"
+      labelCol={{ span: 6 }}
+      wrapperCol={{ span: 18 }}
+      autoComplete="off"
+      form={form}
+      onValuesChange={onValuesChange}
+    >
+      <TopNItem initialValue={10}></TopNItem>
+      <Form.Item
+        label={t('email')}
+        name={'email'}
+        tooltip={t('emailTip')}
+        rules={[{ type: 'email' }]}
+      >
+        <Input></Input>
+      </Form.Item>
+    </Form>
+  );
+};
+
+export default PubMedForm;