Add Graph Baidusearch and dsl_example (#1378)

### What problem does this PR solve?

#918 

### Type of change

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

graph/component/baidu.py

@@ -0,0 +1,62 @@
+#
+#  Copyright 2024 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+import random
+from abc import ABC
+from functools import partial
+import pandas as pd
+import requests
+import re
+
+from graph.component.base import ComponentBase, ComponentParamBase
+
+
+class BaiduParam(ComponentParamBase):
+    """
+    Define the Baidu component parameters.
+    """
+
+    def __init__(self):
+        super().__init__()
+        self.top_n = 10
+
+    def check(self):
+        self.check_positive_integer(self.top_n, "Top N")
+
+
+class Baidu(ComponentBase, ABC):
+    component_name = "Baidu"
+
+    def _run(self, history, **kwargs):
+        ans = self.get_input()
+        ans = " - ".join(ans["content"]) if "content" in ans else ""
+        if not ans:
+            return Baidu.be_output(self._param.no)
+
+        url = 'https://www.baidu.com/s?wd=' + ans + '&rn=' + str(self._param.top_n)
+        headers = {
+            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.104 Safari/537.36'}
+        response = requests.get(url=url, headers=headers)
+
+        baidu_res = re.findall(r'"contentText":"(.*?)"', response.text)
+        url_res = re.findall(r"'url': \\\"(.*?)\\\"}", response.text)
+        for i in range(min(len(baidu_res), len(url_res))):
+            baidu_res[i] += '<a>' + url_res[i] + '</a>'
+
+        del url_res
+
+        br = pd.DataFrame(baidu_res, columns=['content'])
+        print(">>>>>>>>>>>>>>>>>>>>>>>>>>\n", br)
+        return br