feat: cdn speed test

Closes #105

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

lib/utils/storage.dart

@@ -287,6 +287,9 @@ class GStorage {
   static bool get continuePlayingPart =>
       setting.get(SettingBoxKey.continuePlayingPart, defaultValue: true);
 
+  static bool get cdnSpeedTest =>
+      setting.get(SettingBoxKey.cdnSpeedTest, defaultValue: true);
+
   static List<double> get dynamicDetailRatio => List<double>.from(setting
       .get(SettingBoxKey.dynamicDetailRatio, defaultValue: [60.0, 40.0]));
 
@@ -495,6 +498,7 @@ class SettingBoxKey {
       subtitleBgOpaticy = 'subtitleBgOpaticy',
       badCertificateCallback = 'badCertificateCallback',
       continuePlayingPart = 'continuePlayingPart',
+      cdnSpeedTest = 'cdnSpeedTest',
 
       // Sponsor Block
       enableSponsorBlock = 'enableSponsorBlock',

lib/utils/video_utils.dart

@@ -12,10 +12,10 @@ class VideoUtils {
         RegExp(r'^https?://\d{1,3}\.\d{1,3}').hasMatch(url);
   }
 
-  static String getCdnUrl(dynamic item) {
+  static String getCdnUrl(dynamic item, [defaultCDNService]) {
     String? backupUrl;
     String? videoUrl;
-    String defaultCDNService = GStorage.setting
+    defaultCDNService ??= GStorage.setting
         .get(SettingBoxKey.CDNService, defaultValue: CDNService.backupUrl.code);
     if (item is AudioItem) {
       if (GStorage.setting