protocols: add hyprland_focus_grab_v1 implementation (#5850)

* protocols: add hyprland_focus_grab_v1 implementation

* protocols/focus_grab: fix keyboard focus staying on unlisted windows

When creating a focus grab with layershell surfaces, the last active
toplevel kept keyboard focus.

* protocols/focus_grab: fix formatting

* protocols/focus_grab: try to pick surface for keyboard focus

* focus_grab: update keyboard focus to match spec

* Revert "protocols/focus_grab: try to pick surface for keyboard focus"

This reverts commit 090358d0d19cc65208641eaefa0a905e99145730.

* protocols/focus_grab: fix issues and match new spec

* kde-server-decoration: move to new impl

* protocols/focus_grab: review fixup

* Update hyprland-protocols

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Co-authored-by: Vaxry <vaxry@vaxry.net>