[w-autocomplete] Groups

[DerrikMilligan]

One things that could be an interesting and useful feature for the autocomplete is the idea of grouping like elements together. Similar to how an <optgroup> functions inside a <select> grouping together similar <option>s.

@antoniandre I'm sure you'll have some ideas for how this could be done better or more in your style. I was just getting some thoughts out there and maybe some groundwork.

This is how this ends up looking:

And while filtering with the groups:

Shortcomings and thoughts about how I currently have it:

• I think that having to nest the v-for loops feels kind of bad and potentially has performance improvements if we made a computed value that split the filteredItems into groups so it could potentially be a faster render.
• Currently the group labels always display. Even if there are no filtered items within it. I think the computed route could potentially solve this in an easier way. See:
  

I know that the w-autocomplete is a WIP and so is this PR. Let me know what you think and we can tweak stuff.

[antoniandre]

Good idea and result! I'll test locally and see if I find a tweak before publishing.