Add debounce to racer calls about irust HOT 5 CLOSED

yeah I noticed it, I think the best idea is to add debouncing, hopefully its not that hard :)

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@pzmarzly would be great if you test out 55a00e3

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Well, it is fast now, though autocomplete does not trigger after pasting (as due to synchronous nature of the event loop, it doesn't know if a character is the last one). I don't think it's that much of an issue, and changing that would require major changes to IRust. I'm fine with current state.

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Auto complete doesn't trigger after pasting cause I'm not using a real debouncer.
A real debouncer triggers the function after timer expires, something like this

use std::time::{Duration, Instant};

const WAIT_TIMEOUT: u64 = 50;

pub struct Debouncer {
    timer: Instant,
    function: Option<impl Fn>
}

impl Debouncer {
    pub fn new() -> Self {
        Self {
            timer: Instant::now(),
            function: None,
        }
    }

    pub fn start(&mut self) {
        std::thread::spawn(||{
            if self.timer.elapsed() >= Duration::from_millis(WAIT_TIMEOUT) {
                self.function;
            }
        })
    }
    pub fn run(&mut self, mut function: impl FnMut() -> std::io::Result<()>) {
        self.function = Some(function);
        self.timer = Instant::now();
    }
}

Then call start() at the begining of the program so it checks the timer all the time to know when it should trigger the callback
But Its not easy to implement I would need some guidance to make it work

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But I'm also satisfied with current result so we I think we should just leave this for the future^^

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