feature: Support multiline input in ask

Did you check the docs?

• I have read all the docs

Is your feature request related to a problem? Please describe.

I often write longer when using ask, and single line input box doesn't look great; it's also hard for me to do any modifications to the prompt.

Describe the solution you'd like

I understand that when using snacks, it only supports a single line input box. But essentially, we should have a fixed-width floating window that can take multiple lines of input, and ideally, I could also switch between normal/visual/insert mode for quick modification.

Describe alternatives you've considered

No other alternatives were considered.

Additional context

No response