feat: 底部播放进度条设置

lib/plugin/pl_player/models/bottom_progress_behavior.dart

@@ -0,0 +1,23 @@
+// ignore: camel_case_types
+enum BtmProgresBehavior {
+  alwaysShow,
+  alwaysHide,
+  onlyShowFullScreen,
+}
+
+extension BtmProgresBehaviorDesc on BtmProgresBehavior {
+  String get description => ['始终展示', '始终隐藏', '仅全屏时展示'][index];
+}
+
+extension BtmProgresBehaviorCode on BtmProgresBehavior {
+  static final List<int> _codeList = [0, 1, 2];
+  int get code => _codeList[index];
+
+  static BtmProgresBehavior? fromCode(int code) {
+    final index = _codeList.indexOf(code);
+    if (index != -1) {
+      return BtmProgresBehavior.values[index];
+    }
+    return null;
+  }
+}