select-menu widget should be able to customize aria-label or aria-labeledby attribute

[xy322]

In most cases, we will have a label before a select menu, which describes what the menu is for. And it makes senses to attach the label to the select menu.

Take the first select menu in ​https://jqueryui.com/selectmenu/ as an example. It is expected for the screen reader to read "Select a speed combo box, medium selected". But it is saying "medium combo box" instead.