feat(cardwired): implement 'add' and 'remove' uevent

[luytan]

Description

Send 'add' uevent on unblock and 'remove' uevent on block

This will be opt-in for now, and will be placed in the experimental section until its stabilized and battle-tested

Fixes # (issue)

TODO

• Tested on Niri x NixOS
• Tested on KDE x NixOS
• Tested on Gnome x NixOS
• Tested on other distributions

Checklist:

• My code follows the style guidelines of this project (cargo fmt)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the mdBook documentation
• My changes generate no new warnings (clippy/clang)
• New and existing unit tests pass locally with my changes (either use nix flake check or wait for the ci)

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