Automatically set bundle version properties for CMake iOS app projects

When building a Qt example CMake project targeting the iOS simulator, Xcode fails to deploy the project to the simulator with the error

The application's Info.plist does not contain CFBundleVersion.
Ensure your bundle contains a CFBundleVersion.

Failed to install the requested application
Domain: NSPOSIXErrorDomain
Code: 22
Failure Reason: The application's Info.plist does not contain CFBundleVersion.
Recovery Suggestion: Ensure your bundle contains a CFBundleVersion.

There's a similar requirement when targeting a real iOS device.

The bundle version can be specified with the following target properties

MACOSX_BUNDLE_BUNDLE_VERSION
MACOSX_BUNDLE_LONG_VERSION_STRING
MACOSX_BUNDLE_SHORT_VERSION_STRING

https://cmake.org/cmake/help/latest/prop_tgt/MACOSX_BUNDLE_INFO_PLIST.html

Currently Qt Creator has wizards where these properties are set in the newly generated project.

https://codereview.qt-project.org/c/qt-creator/qt-creator/+/334230/2/share/qtcreator/templates/wizards/projects/qtquickapplication/CMakeLists.txt#76

This is nice, except for the fact that almost none of our pre-existing Qt CMake examples set these properties, so they don't build / launch out of the box.

We should try to augment _qt_internal_finalize_ios_app to set some default version numbers if the user hasn't specified them yet, to make the out-of-the-box iOS experience nicer.