Investigate Choices.js for Select

[bryevdv]

As long as we are already bringing in choices.js as a dependency, I think we could consider switching to using their Single / Multi Select widgets (scroll down the page to see):

https://choices-js.github.io/Choices/

They are definitely more modern/nicer looking, and support asked-for features like better search and remote fetch for options, out of the box.

cc @bokeh/dev

[philippjfr]

I agree, if we're already pulling in the dependency we may as well leverage all the nice features it provides.

[mattpap]

I would keep native widgets and move them to a separate bundle.

[bryevdv]

@mattpap Not sure I understand the proposal, are you saying you'd have Select and a separate FancySelect? I am 👎 on that, I think we should be opinionated here and offer the best UX we are capable of offering as the default.

[mattpap]

I will close this given that we will be dropping external widget dependencies in near future (see e.g. PR #13551). I will implement new Select widget using generalized PaletteSelect's logic.