Refactor `MenuBar` and `StatusBar` to be adornments

[tig]

This is a sub-issue of:

• #2994

Todo

• [ ] Reimplemen these views based on Bar. See https://github.com/gui-cs/Terminal.Gui/issues/3073
• [ ] Remove the dependency between these classes and Toplevel and enable any view to host a menubar or statusbar (or any View).
• [ ] By default Window will have the menubar and statusbar's added to it's Border/Adornment Frame but they will be Visible = false by default. We'll expose helper properties to access them:

win.MenuBar.Visible = true etc...