Support key release events

[jjant]

Is your feature request related to a problem? Please describe.
I'm making a piano-like UI and I need to detect key up events to know when to stop playing the note for that key.

Describe the solution you'd like
An additional field in KeyEvent for Press/Release.

Additional context
Just FYI, termion doesn't seem to provide this either.

[sigmaSd]

It is is possible in master(not released) yet using the kitty protocol.
See https://github.com/crossterm-rs/crossterm/blob/master/src/event.rs#L357 it also contains the list of supported terminals.

To use it just add:

    execute!(stdout, PushKeyboardEnhancementFlags(KeyboardEnhancementFlags::REPORT_EVENT_TYPES))?;

and run it in a supported terminal.

[David-Else]

This feature was release in 0.25, the issue can be closed.

[TimonPost]

Its partially possible for those that have a kitty terminal