feat(ui): 'pumborder' (popup menu border) #25541

Problem:
Popup menu cannot have a border.

Solution:
Support 'pumborder' option.
Generalize `win_redr_border` to `grid_redr_border`,
which redraws border for window grid and pum grid.

test/functional/ui/cursor_spec.lua

@@ -258,11 +258,11 @@ describe('ui/cursor', function()
         end
       end
       if m.hl_id then
-        m.hl_id = 66
+        m.hl_id = 67
         m.attr = { background = Screen.colors.DarkGray }
       end
       if m.id_lm then
-        m.id_lm = 77
+        m.id_lm = 78
         m.attr_lm = {}
       end
     end