feat: Baidu Tongji analytics module (#1087)

server/modules/analytics/baidutongji/code.yml

+head: |
+  <!-- Baidu Tongji -->
+  <script>
+    var _hmt = _hmt || [];
+    (function() {
+      var hm = document.createElement("script");
+      hm.src = "https://hm.baidu.com/hm.js?{{propertyTrackingId}}";
+      var s = document.getElementsByTagName("script")[0]; 
+      s.parentNode.insertBefore(hm, s);
+    })();
+  </script>

server/modules/analytics/baidutongji/definition.yml

+key: baidutongji
+title: Baidu Tongji
+description: Baidu Tongji is a web analytics service offered by Baidu that tracks and reports website traffic.
+author: lawrenceching
+logo: https://static.requarks.io/logo/baidu.svg
+website: https://tongji.baidu.com
+isAvailable: true
+props:
+  propertyTrackingId:
+    type: String
+    title: Property Tracking ID
+    hint: Unique Property ID (found at the end of the tracking URL, e.g. https://hm.baidu.com/hm.js?XXXXXXXXXXXX)
+    order: 1