Add a split button to terminal panes (#21251)

Follow-up of https://github.com/zed-industries/zed/pull/21238

<img width="873" alt="image"
src="https://github.com/user-attachments/assets/8cf2d8ea-a1df-4a6a-95d6-5867e0ee287d">

Release Notes:

- N/A

Kirill Bulatov committed 1y ago

34ed48e14bcf48a2dea2bc9b237bc669601e0a88

Parent: 0c8e555

Committed by GitHub <noreply@github.com> on 11/27/2024, 9:17:44 PM