Add an input example to gpui (#13534)

Add a single-line text input example to gpui

(I'm hoping to be able to debug keyboard issues without rebuilding the
whole
app every time)

Release Notes:

- N/A
b43df6048bConrad Irwin committed on 6/26/2024, 4:06:50 AM· committed by GitHubparenteb91468
5 files changedLine totals unavailable