window: Move some display level window processing to MetaDisplay

meta_window_(un)queue() was implemented with global arrays in window.c
that managed MetaLater handle IDs and lists of window queues. In order
to rely less on scattered static variables and making it clearer that
we're dealing with per display window management and not something
specific to a single window, move the window resize/calc-showing queue
management to MetaDisplay.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2264>

src/core/stack.c

@@ -416,6 +416,8 @@ meta_stack_thaw (MetaStack *stack)
 {
   g_return_if_fail (stack->freeze_count > 0);
 
+  COGL_TRACE_BEGIN_SCOPED (MetaStackThaw, "Stack: thaw");
+
   stack->freeze_count -= 1;
   meta_stack_changed (stack);
   meta_stack_update_window_tile_matches (stack, NULL);