Support progress bar (OSC9;4)

[yochem]

The OSC9;4 progress bar sequence could be used to have a UI-native progress bar, simply set to round(current slide index / total slides). Supporting terminals are at least the Windows Terminal and Ghostty. Kitty ignores it (others not checked). It should probably be configurable (simply on/off).

I've never written Rust so I'm not sure if I can submit a PR, but it seems that this could be implemented in the jump_* methods of the Presentation "class".