Support more emacs-style keybindings in TextArea

[mgesbert]

The missing ones we have currently identified are:

• ctrl+u doesn't remove previous \n when cursor is at the beginning of the line (but ctrl+k actually has the good behavior regarding \n)
• ctrl+b: Move cursor backward (left)
• ctrl+f: Move cursor forward (right) - instead, it currently deletes the next word
• ctrl+backspace: delete previous word (this one is probably also linked to kitty protocol support)
• option+delete: Delete end of word
• ctrl+p: Move cursor to the previous line
• ctrl+n: Move cursor to the next line

Side note: would it make sense to support cmd+Z at the TextArea level?

[github-actions]

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[willmcgugan]

Yeah, this should be straightforward. Ideally it would all go in to the builtin TextArea, but custom bindings remain an option.

[willmcgugan]

@mgesbert Until very recently Mac terminals didn't report the cmd modifier. Now at least Ghostty and Kitty do. iTerm doesn't unfortunately.

I'll bind cmd+Z and friends in the associate PR, but it won't be universally supported.

[willmcgugan]

Update here: #6543