toggle: add spawnThenToggle client option

[Qbushey]

Fixes #73

Windows spawned via IPC (e.g. caelestia shell controlCenter open) ignore the [workspace special:X] exec rule, so the first caelestia toggle <ws> spawns the window on the current workspace and never opens the special workspace; only the second toggle moves it there.

This adds a per-client spawnThenToggle option that dispatches togglespecialworkspace right after the client command is spawned, which is the approach Mestane tested and confirmed working in the issue thread.

"controlcenter": {
    "Caelestia Settings": {
        "enable": true,
        "match": [{ "initialTitle": "Caelestia Settings" }],
        "command": ["caelestia", "shell", "controlCenter", "open"],
        "move": true,
        "spawnThenToggle": true
    }
}

Default behaviour is unchanged: without the option set, toggling works exactly as before.

[Mestane]

This is more accurate for json files. I didn't really pay much attention to it. you can delete the snake_case client. It's better this way.