Move KeyUp/KeyDown client side

[pinetops]

Responsiveness can get a bit poor if you increase latency. KeyUp/KeyDown is a place that it would be pretty easy to move to the hook.

Happy to submit a PR for this, but let me know if you'd like this to replace current behavior or be enabled based on a new option.

[maxmarcon]

Thanks. I think everything gets poor in LiveView when you increase latency :)
That said, I'm open to move functionality to the hook if it increases UX. Maybe you can create a simple PR that showcases what you have in mind, and we can take it from there.