Ability to separately set content to `byId` state and `ids` state

It's definitely helpful having combined actions which manage both byId and ids states in one hit, however in many cases you want to be able to add something to the byId state without setting it into ids.

Example case would be E.g., a blog articles listing page where we need to load articles, category listing, and a featured article at the top. When loading the article page, and the featured article, we don't want to set the ids state, as we're using this for the category listing. We only want to update the byId store so we can retrieve that articles details.