add multiline text input field

[roele]

Add single multi-line text input field e.g https://github.com/charmbracelet/huh/tree/main?tab=readme-ov-file#text

[roele]

Thats seems quite a bit more involved than the single-line input.

• requires scolling of input within a max_height' of lines (maybe just show a slice [line:]`)
• requires multi-key capture to enable hard line-breaks via alt+enter
• needs to handle soft line-breaks within the visible lines

[jdx]

I'm a little unsure how useful this is. I've never needed a field like this in a CLI.