[Feature Request] Auto tile when a second window is spawned on the desktop

Add auto-tiling customization. Allow auto tiling when a second application window is requested. E.g., until a second window is spawned on the desktop, the first window always just spawns at it's default size/position (or last used size, if set). Once a second window is spawned, both windows will then be tiled based on the tiling layout. Other tiling window managers usually start the first window as maximized which is fine if you're using 16:9, but is really rough on an ultra wide. Having an option to have tiling kick in when there are 2 or more windows would make tiling workflows much more user friendly and visually appealing for all monitor shapes and sizes, I believe.

This was suggested by a user on reddit in [this](https://www.reddit.com/r/gnome/comments/1hywkh1/comment/m6lr04o/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button) post.