Feature request: kitty keyboard protocol

[comex]

Support the kitty keyboard protocol, invented by the kitty terminal but also implemented in a number of other terminals and terminal applications (listed on that page). This is more flexible and less ambiguous than standard keyboard handling. It has the terminal essentially send raw key events, allowing for terminal applications to detect things like modifier keys pressed by themselves, combinations of modifier keys, or (most interesting to me) additional modifier keys like the Command key.