Parse Kitty Keyboard Protocol esc codes to suport Ctrl-Shift-<Key> shortcuts

[UnnaturalTwilight]

Adds parsing for the most basic form of Kitty keyboard events. This fixes the existing Ctrl-Shift-z shortcut for redo when using a terminal that implements the kitty keyboard protocol. I have also add Ctrl-Shift-c as an additional shortcut for copy since that is often used in terminals.

Not a full implementation but solves some of: #29

I have tested this in Kitty on linux and in Windows Terminal through WSL.
I have only tested this with an en-us qwerty keyboard layout.

[UnnaturalTwilight]

@microsoft-github-policy-service agree

[lhecker]

...but you aren't enabling the Kitty Keyboard Protocol on startup?

[UnnaturalTwilight]

Per the spec, any key sequence that can't be represented without the Kitty Keyboard Protocol is sent using it regardless if it is requested. I was trying to avoid affecting any of the current parsing logic but if you think it is better to enable it I can add that.
https://sw.kovidgoyal.net/kitty/keyboard-protocol/#:~:text=Any%20key,enhancement

[lhecker]

Since nothing is using Ctrl-Shift combinations yet we can take our time to do this properly: Implement a full Kitty Keyboard Protocol integration. One of the problems here is that this PR is using from_ascii but the protocol does not limit the key code to ASCII.

[UnnaturalTwilight]

I have now done a more complete implementation of the first level of progressive enhancement for the protocol. I don't think higher levels of enhancement are necessary for what edit dose.

I was not able to find a relevant vk constant for numpad equals which is why it stands out in the list.
I also couldn't find an applicable vk constant for the menu key which is the only one of the keys that are currently ignored that I think may make sense to add key a keybinding to.

I have also now tested this with a french keyboard layout to confirm that non-ascii characters work properly.