Review SingleSelect Implementation

[jallers]

I would like to review some implementation changes to SingleSelect that alters both how consumers work with the component.

SingleSelect should focus on being a text input way of filtering a list of options. A dropdown or select without a text input should belong to a different component.

SingleSelect should be more opinionated about how to render a set of options, potentially deferring to the consumer to produce the DOM for the individual options, but producing a wrapper and potentially default implementation of the render.

I think the relationship between menu and list is confusing and makes reasoning about the performance harder.