Should we add unknown sequences variants?

[zrzka]

Version 0.1.6 provides:

pub enum Sequence {
    Key(KeyCode, KeyModifiers),
    Mouse(Mouse, KeyModifiers),
    CursorPosition(u16, u16),
}

Parser throws away every csi/esc sequence without known meaning (valid sequence, but we have no idea what it is). What's the problem. Any sequence, which isn't supported by anes is trashed and crate user doesn't even know it. Is this something we should expose? Should we add Sequence::UnknownEsc(char) & Sequence::UnknownCsi(Vec<u64>, usize, char)?