Export Container as QuillContainer to avoid naming conflicts

lib/flutter_quill.dart

@@ -1,5 +1,7 @@
 library flutter_quill;
 
+import 'src/models/documents/nodes/container.dart';
+
 export '/src/widgets/raw_editor/quill_single_child_scroll_view.dart';
 export 'src/extensions/quill_configurations_ext.dart';
 export 'src/models/config/quill_configurations.dart';
@@ -8,7 +10,6 @@ export 'src/models/config/toolbar/toolbar_configurations.dart';
 export 'src/models/documents/attribute.dart';
 export 'src/models/documents/document.dart';
 export 'src/models/documents/nodes/block.dart';
-export 'src/models/documents/nodes/container.dart';
 export 'src/models/documents/nodes/embeddable.dart';
 export 'src/models/documents/nodes/leaf.dart';
 export 'src/models/documents/nodes/line.dart';
@@ -38,3 +39,5 @@ export 'src/widgets/toolbar/buttons/alignment/select_alignment_button.dart';
 export 'src/widgets/toolbar/buttons/hearder_style/select_header_style_dropdown_button.dart';
 export 'src/widgets/toolbar/simple_toolbar.dart';
 export 'src/widgets/utils/provider.dart';
+
+typedef QuillContainer = Container;