WIP implementation for inhibiting system shortcuts

[ids1024]

Implementation for https://github.com/rust-windowing/winit/issues/2776, on Wayland currently only.

Wayland implementation should be done more cleanly, needs X11 and any other applicable platforms, documentation etc. And this will need the feature to be merged in sctk and released.

• [ ] Tested on all platforms changed
• [ ] Added an entry to CHANGELOG.md if knowledge of this change could be valuable to users
• [ ] Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• [ ] Created or updated an example program if it would help users understand this functionality
• [ ] Updated feature matrix, if new features were added or implemented