Dropdown | Add searching (with callbacks)

[aVileBroker]

We should have a default internal search which sorts the current option list, which can be turned off and onChange callbacks (also pass the onDebouncedChange callback up as a separate function)

I like to use fuse.basic.js for fuzzy searching lists on client-side. It weights the results and allows for mispellings, searching multiple properties in a nested object, and weights for each property in nested objects. It also returns where in the strings the matches occur so that we can highlight/bold the letters which match the search.

The API could be

• searchable
• searchFiltersOptions (needs a better name - but this would be what tells us to filter the list ourselves, and add the boldness to the matched patterns)
• onSearchChange
• onDebouncedSearchChange