Move to splits more ergonomically (#31449)

Part of https://github.com/zed-industries/zed/discussions/24889

Release Notes:

- Made `workspace::MoveItemToPaneInDirection` and
`workspace::MoveItemToPane` to create non-existing panes
f8365c5375Kirill Bulatov committed on 5/26/2025, 9:59:47 PM· committed by GitHubparent2c80492
1 file changedLine totals unavailable