Bind set_suffix/get_suffix in Tree

(cherry picked from commit ac8814624dcf7ca4161198054fcbb84a907fe341)

scene/gui/tree.cpp

@@ -777,6 +777,9 @@ void TreeItem::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_text", "column", "text"), &TreeItem::set_text);
 	ClassDB::bind_method(D_METHOD("get_text", "column"), &TreeItem::get_text);
 
+	ClassDB::bind_method(D_METHOD("set_suffix", "column", "text"), &TreeItem::set_suffix);
+	ClassDB::bind_method(D_METHOD("get_suffix", "column"), &TreeItem::get_suffix);
+
 	ClassDB::bind_method(D_METHOD("set_icon", "column", "texture"), &TreeItem::set_icon);
 	ClassDB::bind_method(D_METHOD("get_icon", "column"), &TreeItem::get_icon);