Allow StatusBarBehavior to Hide Status Bar

[david-maw]

On Android at least, it is possible to hide the Statusbar icons altogether. This seems like a reasonable thing for StatusBarBehavior to be able to control for apps seeking an immersive experience.

[bijington]

I'm not sure it's simple enough to control through StatusBarBehavior. You can make you app full screen as per https://stackoverflow.com/questions/71361984/how-to-set-a-contentpage-in-maui-full-screen-or-immersive#71376589