iOS: Decouple UIWindow management from QIOSScreenHEADdev

We now adopt the UIScene lifecycle, where we react to iOS creating
UIWindowScenes for connected screens, which we then configure with
a single instance of our QUIWindow, that in turn contains the
QIOSViewController and QIOSDesktopManagerView that we depend on
for our window management.

As a result, we can now create and show QWindows on visionOS,
which doesn't have UIScreen and hence failed with our old strategy
managing our UIWindow via UISScreen.

We still do not declare a UIApplicationSceneManifest in our Info.plist,
or report UIApplicationSupportsMultipleScenes, as this adds another
level to the window management that we're not ready for yet.

Task-number: QTBUG-121781
Change-Id: Ic02f43aa6b205289a3f3c8e72c2a6ef575031d9a
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

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