Optimization suggestions: Add debounce ability to trigger search function

[suziwen]

Just like using this function https://underscorejs.org/#debounce

And also can add a options minChar. when the search string is too short, the search function will not be triggered.

[TheJaredWilcurt]

Tried to do a simple debounce on this, but it causes a race condition, where you can get out-of-order results. The branch is up as a PR, but the feature won't be merged until that is addressed.