Search thru options in sl-select

[staabm]

Is your feature request related to a problem? Please describe.
In selects with hundreds of options it would be great to have a search feature to ease usage

Describe the solution you'd like
In a pre web-component world we used e.g. https://harvesthq.github.io/chosen/ to achieve this kind of functionality

[trailsnail]

Same request in #127?

[claviska]

Yep, this is a dupe of #127.