Investigate performance of `EventActions::event_menu_model`
From: https://gitlab.gnome.org/GNOME/fractal/-/merge_requests/900#note_1323280
We generate the menu model every time with gtk::Builder
in event_menu_model
.
The goal is to profile it and see if we find something that could be more performant. An idea was to declare it as static Lazy<Mutex<gio::MenuModel>>