Add support for iOS, macOS and Android (and possibly other platforms) in _WindowSDL2Storage.get_window_info

[misl6]

Currently only Linux (X11, Wayland) and Windows are returning a valid "info" object in _WindowSDL2Storage.get_window_info.

As this feature will now be needed by #8650 to expose a valid native window handle (e.g. for accessibility tools ), is important to have an implementation for every platform that Kivy officially supports.

Adding support, for the SDL2 (or soon SDL3) Window provider, seems quite straightforward, as SDL_GetWindowWMInfo already provides the data we need inside the returned SDL_SysWMinfo struct.

[misl6]

Hi @its-joseph-230606 , why you think we should close this issue? Do you have a PR for it?

[misl6]

As we're performing a migration from SDL2 to SDL3, please keep this just as a backlog, and do not start working on it as the implementation of such a feature on SDL3 is completely different (and easier).