expose floating view alignment enum (#723)

Author: Brazol

packages/stream_video_flutter/lib/stream_video_flutter.dart

@@ -39,6 +39,7 @@ export 'src/models/stream_icon_toggle.dart';
 export 'src/renderer/video_renderer.dart';
 export 'src/theme/themes.dart';
 export 'src/utils/device_segmentation.dart';
+export 'src/widgets/floating_view/floating_view_alignment.dart';
 export 'src/widgets/floating_view/floating_view_container.dart';
 export 'src/widgets/size_change_listener.dart';
 export 'src/widgets/stream_user_avatar.dart';