Add --pointer-multi for pointer which on multi lines candidate?

### Checklist

- [x] I have read through the manual page (`man fzf`)
- [x] I have searched through the existing issues
- [x] For bug reports, I have checked if the bug is reproducible in the latest version of fzf

### Output of `fzf --version`

0.61.1 (brew)

### OS

- [ ] Linux
- [x] macOS
- [ ] Windows
- [ ] Etc.

### Shell

- [ ] bash
- [x] zsh
- [ ] fish

### Problem / Steps to reproduce

I've read through this: https://junegunn.github.io/fzf/tips/processing-multi-line-items/

Say I have a multi line command and try to fuzzy with fzf, on multi line candidate in the list I want to have a different cursor/pointer icon rather than use current with `--pointer`.