feat: Implement artist downloading in Dart

lib/funkblubber.dart

@@ -13,11 +13,37 @@ Future<void> download({
       await _downloadAlbum(object, path);
       return;
 
+    case FunkEntity.artist:
+      await _downloadArtist(object, path);
+      return;
+
     default:
       return;
   }
 }
 
+Future<void> _downloadArtist(
+  final FunkObject object,
+  final String path,
+) async {
+  final response = await Dio().get(
+    'https://${object.domain}/api/v1/albums/?'
+    'artist=${object.id}&ordering=creation_date&'
+    'page=1&page_size=16&scope=all',
+  );
+
+  for (final albumResponse in response.data['results']) {
+    _downloadAlbum(
+      FunkObject(
+        domain: object.domain,
+        id: albumResponse['id'].toString(),
+        kind: FunkEntity.album,
+      ),
+      path,
+    );
+  }
+}
+
 Future<void> _downloadAlbum(
   final FunkObject object,
   final String path,