Same as xset dpms force off, but for Wayland.
It requires zwlr_output_power_manager_v1 and ext_idle_notifier_v1 support from the Wayland compositer. wlroots supports them.
It turns off all monitors, and then it turns them back on when user activity re-occurs. Don't interrupt the process, or your monitor won't be turned on later!
Install the Rust toolchain and cargo build --release to build and find the built binary under target/release.