feat: support extended keyboard enhancements (#1626)

This adds support for the Kitty keyboard protocol's extended
enhancements, allowing applications to request that the terminal report
additional information about key events, such as whether they're part of
a repeat sequence, alternate key values, and associated text.

Supersedes: https://github.com/charmbracelet/bubbletea/pull/1622
Fixes: https://github.com/charmbracelet/bubbletea/issues/1621
Fixes: https://github.com/charmbracelet/bubbletea/issues/1623