Make SoundboardSound have a CDN asset

Author: Lexedia

lib/src/http/cdn/cdn_asset.dart

@@ -24,7 +24,12 @@ enum CdnFormat {
   /// The Lottie format.
   ///
   /// This is only available to sticker endpoints where [Sticker.formatType] is [StickerFormatType.lottie].
-  lottie._('lottie');
+  lottie._('lottie'),
+
+  /// The mp3/ogg format.
+  ///
+  /// This is only available to soundboard endpoints.
+  mp3._('');
 
   /// The extension to use on the CDN endpoint for this format.
   final String extension;
@@ -75,7 +80,11 @@ class CdnAsset {
     for (final part in base.parts) {
       route.add(part);
     }
-    route.add(HttpRoutePart('$hash.${format.extension}'));
+
+    // Soundboard assets don't have any extension.
+    final ext = format == CdnFormat.mp3 ? '' : '.${format.extension}';
+
+    route.add(HttpRoutePart('$hash$ext'));
 
     return CdnRequest(route, queryParameters: {if (size != null) 'size': size.toString()});
   }

lib/src/models/soundboard/soundboard.dart

@@ -1,4 +1,6 @@
+import 'package:nyxx/src/http/cdn/cdn_asset.dart';
 import 'package:nyxx/src/http/managers/soundboard_manager.dart';
+import 'package:nyxx/src/http/route.dart';
 import 'package:nyxx/src/models/emoji.dart';
 import 'package:nyxx/src/models/guild/guild.dart';
 import 'package:nyxx/src/models/snowflake.dart';
@@ -10,6 +12,16 @@ class PartialSoundboardSound extends WritableSnowflakeEntity<SoundboardSound> {
   final SoundboardManager manager;
 
   PartialSoundboardSound({required super.id, required this.manager});
+
+  /// The sound asset for this soundboard sound.
+  CdnAsset get sound => CdnAsset(
+        client: manager.client,
+        base: HttpRoute()..soundboardSounds(),
+        // We can't use .soundboardSounds(id: id.toString()) because hash would be empty, adding an empty string will populate 
+        // `route.segments` which will join it with a trailing slash and Discord doesn't handle trailing slashes.
+        hash: id.toString(),
+        defaultFormat: CdnFormat.mp3,
+      );
 }
 
 class SoundboardSound extends PartialSoundboardSound {