test: add tests for StreamFeedsClient

Author: xsahil03x

packages/stream_feeds/dart_test.yaml

@@ -10,6 +10,7 @@ tags:
   comment-reply-list:
   feed:
   feed-list:
+  feeds-client:
   follow-list:
   member-list:
   moderation-client:

packages/stream_feeds/lib/stream_feeds.dart

@@ -1,5 +1,7 @@
 export 'package:stream_core/stream_core.dart';
 
+export 'src/cdn/cdn_api.dart';
+export 'src/cdn/feeds_cdn_client.dart';
 export 'src/feeds_client.dart';
 export 'src/generated/api/api.dart' hide User;
 export 'src/models.dart';