feat: support custom key mapping

[eeeXun]

No description provided.

[doums]

Hey, so I checked a bit the PR, first thx for it.
As my 2 cents feedback, I'd say it's not ideal as it only allows keys to combine with arbitrary Ctrl modifier. Which is a bit restrictive and I think will be a bit confusing for the user. Usually when user provide their keymap, they expect to provide full combination (key + modifier) as they wish.
But as you said you made this way because of avoiding conflict with default TUI framework bindings, maybe for some other reason?

In any case I think this should appear clearly in the README, like "Only keybinding with Ctrl modifier are supported. Please only provide the key for each custom keybind (Ctrl is always assumed)"

[eeeXun]

Thanks for the feedback.

But as you said you made this way because of avoiding conflict with default TUI framework bindings, maybe for some other reason?

After looking into it. I found it's not conflict. It can be overwritten. Currently, it only provide key with modifier Ctrl and function key from F1 to F64.

I'd say it's not ideal as it only allows keys to combine with arbitrary Ctrl modifier.

Yes, you are right. This is not an idea design. But other modifier, like Alt, is a bit cumbersome to handle. I look the lf, which use the same TUI framework, do the job. I might look into how it is designed.

[eeeXun]

In the last commit

For key to combine with Ctrl, the value can be "C-space", "C-\\", "C-]", "C-^", "C-_" or "C-a" to "C-z".

⚠️ Note, don't use "C-c", <C-c> is for exit program.

For key to combine with Alt, the value can be "A-space" or "A-" + the character you want.

Or you can use function key, the value can be "F1" to "F64".

I think this can cover all cases. If the document or the feature is not completed, feedback is still welcome.

[eeeXun]

UPDATE:
You can set "C-c" now. And you can config the exit key.

[doums]

Looks good now