Add a possibility to "await" the moment when new window opens

[nikitabobko]

Problem

Suppose the user wants to open a new window and move to the particular workspace.

The naive solution won't work because open finishes faster than the window appears:

open -n /Applications/kitty.app && aerospace move-node-to-workspace kitty

Proposed solutions

Solution 1. "callback" style command to run next commands once focus changes

aerospace run-when-focus-changes move-node-to-workspace kitty && open -n /Applications/kitty.app

Solution 2. "suspend" style command to await until the next window appears. (Harder to implement but prettier)

aerospace wait-for-new-window open -n /Applications/kitty.app && aerospace move-node-to-workspace kitty

Workaround

Use sleep. It's ugly and fragile

open -n /Applications/kitty.app && sleep 1 && aerospace move-node-to-workspace kitty