feat: new pgc rank

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/bangumi/pgc_rank/stat.dart

@@ -0,0 +1,22 @@
+class Stat {
+  int? danmaku;
+  int? follow;
+  int? seriesFollow;
+  int? view;
+
+  Stat({this.danmaku, this.follow, this.seriesFollow, this.view});
+
+  factory Stat.fromJson(Map<String, dynamic> json) => Stat(
+        danmaku: json['danmaku'] as int?,
+        follow: (json['follow'] as int?) ?? 0,
+        seriesFollow: json['series_follow'] as int?,
+        view: (json['view'] as int?) ?? 0,
+      );
+
+  Map<String, dynamic> toJson() => {
+        'danmaku': danmaku,
+        'follow': follow,
+        'series_follow': seriesFollow,
+        'view': view,
+      };
+}