Considerations:

1. Qt for IOS only officially supports static linking to the executable.
2. The main entrypoint of the application should be qt_main_wrapper which comes from the platform plugin.

ToDo:

1. Export qt_main_wrapper symbol from the qpa since we are planning to link it to libpyside which is a shared library.
2.  Link qpa for iOS to libpyside
3. call `qt_main_wrapper` when PySide6 is loaded.
4. Just like android create a Python script to cross compile PySide for iOS which calls ideally `setup.py build` using a custom cmake toolchain file with the necessary configurations. See pyside-setup/tools/cross_compile_android